Consolidated Statement Of Cash Flows
| Concept | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2021-04-01 to 2022-03-31 | As at 2022-03-31 | As at 2021-03-31 | 
|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                -84,417,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,176,952,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -26,844,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -13,407,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -111,261,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,163,545,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of securities | — | 
                                                -1,276,130,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,323,153,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of securities | — | 
                                                983,877,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                536,238,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of property, plant and equipment | — | 
                                                -3,538,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,491,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                609,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                986,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                3,082,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -372,639,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Purchase of treasury shares | — | 
                                                -5,607,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -18,890,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,098,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of shares of subsidiaries not resulting in change in scope of consolidation | — | 
                                                715,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -23,732,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -26,956,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Effect of exchange rate change on cash and cash equivalents | — | 
                                                60,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                88,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -131,851,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,764,037,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                7,708,412,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,840,263,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,076,226,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |