Shareholdings
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 
|---|---|---|---|---|---|
| Shareholdings | |||||
| Second largest holding company | |||||
| Investment shares reclassified from held for purposes other than pure investment to held for pure investment | |||||
| Issue | 
                                                TOPPANホールディングス株式会社
                                                
                                             | 
                                                株式会社京都フィナンシャルグループ
                                                
                                             | 
                                                株式会社西日本フィナンシャルホールディングス
                                                
                                             | 
                                                SOMPOホールディングス株式会社
                                                
                                             | 
                                                NIPPON EXPRESSホールディングス株式会社
                                                
                                             | 
| Number of shares | 
                                                171,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                319,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                418,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                33,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                41,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                663,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                881,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                802,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                318,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |