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 | 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 | 
                                                33,999,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                225,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                225,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,899,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                146,525,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                143,939,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,050,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                221,986,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                221,986,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                715,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,286,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,626,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,944,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -31,286,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,077,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,035,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -27,916,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,916,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,803,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,876,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,066,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                351,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,023,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                190,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,736,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                433,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,704,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                214,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,489,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                319,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                478,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,519,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,268,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                819,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,221,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,748,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,697,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                745,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,033,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,978,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                535,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |