Consolidated Statement Of Comprehensive Income
| Concept | 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 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of comprehensive income | ||||||||||
| Statement of comprehensive income | ||||||||||
| Profit (loss) | 
                                                3,154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,458,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,705,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other comprehensive income | ||||||||||
| Remeasurements of defined benefit plans, net of tax | — | — | — | — | 
                                                -2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                53,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other comprehensive income | — | — | — | — | 
                                                -2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                53,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | — | — | — | 
                                                4,456,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,758,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income attributable to | ||||||||||
| Comprehensive income attributable to owners of parent | — | — | — | — | 
                                                4,456,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,758,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |