Notes - Segment Information
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | As at 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information | ||||||||||||||
| Segment information | ||||||||||||||
| Revenue | ||||||||||||||
| Revenue from external customers | 
                                                39,812,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,211,856,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,046,394,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                125,650,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,211,856,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                126,647,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,177,399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,371,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,006,381,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,177,399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intersegment revenue | 
                                                1,405,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,303,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                134,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,842,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,842,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,889,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,288,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,449,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,889,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revenue | 
                                                41,217,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,211,856,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,047,697,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                125,784,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,842,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,214,698,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                126,799,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,177,399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,889,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,659,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,007,830,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,180,288,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Segment profit (loss) | 
                                                3,725,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,941,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                76,181,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,878,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,784,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,482,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,670,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                13,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,572,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,657,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other income and expenses, net | — | 
                                                -76,755,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -13,180,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Share of profit (loss) of investments accounted for using equity method | — | 
                                                49,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                27,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Profit (loss) before tax | — | 
                                                16,251,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                62,745,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Assets | — | — | — | — | 
                                                1,341,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,266,732,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Investments accounted for using equity method | — | — | — | — | 
                                                4,529,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                4,486,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Depreciation and amortization | 
                                                1,509,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,168,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,670,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,989,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,168,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,691,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,559,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,595,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,273,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,559,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Impairment losses | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,124,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,931,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,193,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,124,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,303,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital expenditures | 
                                                1,644,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,065,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,057,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,065,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,312,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,660,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |