Notes - Segment Information, Etc.
| Concept | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 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 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information, etc. | ||||||||||||||
| Segment information | ||||||||||||||
| Disclosure of sales, profit (loss), asset, liability, and other items for each reportable segment | ||||||||||||||
| Sales | ||||||||||||||
| Revenues from external customers | 
                                                7,859,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                373,683,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                381,542,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                381,661,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                381,661,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                355,493,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                363,276,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                363,366,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                363,366,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,782,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                484,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -484,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                484,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                484,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||||
| Depreciation | 
                                                109,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,071,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,077,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,074,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,403,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,505,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,508,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                132,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,495,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,627,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,635,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,635,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,534,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,690,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,694,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,694,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                156,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |