Shareholdings
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 
|---|---|---|
| Shareholdings | ||
| Reporting company | ||
| Investment shares held for purposes other than pure investment | ||
| Shares not listed | ||
| Number of issues | 
                                                17
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Carrying amount | 
                                                4,945,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Number of issues whose number of shares increased | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total acquisition cost for increased shares | — | 
                                                985,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Reason for increase in number of shares | — | 
                                                主に事業機会探索を目的とした投資
                                                
                                             | 
| Number of issues whose number of shares decreased | — | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total sale amount for decreased shares | — | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shares other than those not listed | ||
| Number of issues | 
                                                10
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Carrying amount | 
                                                5,804,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Number of issues whose number of shares increased | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total acquisition cost for increased shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Reason for increase in number of shares | — |  | 
| Number of issues whose number of shares decreased | — | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total sale amount for decreased shares | — | 
                                                4,280,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |