Shareholdings
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Shareholdings | ||||||||||
| Largest holding company | ||||||||||
| Investment shares reclassified from held for purposes other than pure investment to held for pure investment | ||||||||||
| Issue | 
                                                株式会社ヒマラヤ
                                                
                                             | 
                                                セイノーホールディングス株式会社
                                                
                                             | 
                                                イオン株式会社
                                                
                                             | 
                                                東京海上ホールディングス株式会社
                                                
                                             | 
                                                トヨタ自動車株式会社
                                                
                                             | 
                                                株式会社三菱UFJフィナンシャル・グループ
                                                
                                             | 
                                                株式会社名古屋銀行
                                                
                                             | 
                                                株式会社KVK
                                                
                                             | 
                                                イビデン株式会社
                                                
                                             | 
                                                SOMPOホールディングス株式会社(注)
                                                
                                             | 
| Number of shares | 
                                                484,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,640,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                133,250
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                776,054
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                14,000,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                137,500
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                122,200
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                362,300
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,290,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                1,066,604
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                399,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,781,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,624,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                276,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                961,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                681,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,145,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,822,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |