Notes - Segment Information, Etc.
| Concept | 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 | 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 | 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                1,724,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                307,625,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                307,699,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                307,699,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                145,892,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,007,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                329,389,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,448,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                329,389,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                329,307,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                144,846,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                180,013,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                467,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -467,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                467,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -454,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                454,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                454,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||||||
| Depreciation | 
                                                4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                839,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                841,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                841,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                601,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                234,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                763,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                763,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                763,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                529,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                228,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Equity in earnings (losses) of affiliates | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -208,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -208,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -208,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -101,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -106,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -62,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                248,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments in entities accounted for using equity method | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                232,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,755,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,106,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,106,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,106,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                381,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,724,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,387,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,387,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,387,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,322,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,065,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,192,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,192,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,192,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                637,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                554,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |