Statement Of Changes In Equity
| Concept | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net assets | 
                                                2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                90,005,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -711,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                84,440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,683,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                4,686,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,936,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                94,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                115,751,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                80,246,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -754,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                131,713,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                121,273,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                94,691,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                5,734,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,725,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,490,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                94,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,941,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                2,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,296,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,724,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,768,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                85,727,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,794,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -807,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -764,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                114,502,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,003,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                103,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,854,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,952,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,954,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,003,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                94,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,455,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                86,245,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,660,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,409,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -673,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                91,849,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,195,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,189,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,044,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Changes during period | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dividends of surplus | — | 
                                                -6,395,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -6,343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                -6,395,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -6,395,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                -6,395,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -6,343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -6,343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                -3,878,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,878,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -3,847,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -3,847,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,878,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -3,878,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -3,847,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Profit (loss) | — | 
                                                13,345,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                13,345,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                13,345,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                13,345,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                18,795,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                16,514,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,514,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                16,514,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                16,514,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                20,900,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Net changes in items other than shareholders' equity | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                1,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,560,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,705,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,957,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,141,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                4,705,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -230,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,751,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -230,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,538,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -209,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,538,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -227,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Total changes during period | — | 
                                                6,949,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                12,504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,002,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,964,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,560,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                52,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,705,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,957,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,949,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,141,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,452,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,210,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                52,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,635,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,502,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,053,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,635,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -230,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,751,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,271,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                18,458,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -209,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,538,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -227,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -133,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -133,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |