Shareholdings
| Concept | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|
| Shareholdings | |||
| Largest holding company | |||
| Investment shares held for pure investment | |||
| Shares not listed | |||
| Number of issues | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Carrying amount | — | 
                                                3,225,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,225,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total of dividends received | 
                                                25,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total of gain (loss) on sale | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total of valuation gain (loss) | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Shares other than those not listed | |||
| Number of issues | — | 
                                                55
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                39
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Carrying amount | — | 
                                                40,474,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total of dividends received | 
                                                551,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total of gain (loss) on sale | 
                                                57,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total of valuation gain (loss) | 
                                                22,053,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |