Shareholdings
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 
|---|---|---|
| Shareholdings | ||
| Largest holding company | ||
| Investment shares held for purposes other than pure investment | ||
| Shares not listed | ||
| Number of issues | 
                                                100
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Carrying amount | 
                                                3,797,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Number of issues whose number of shares increased | — | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total acquisition cost for increased shares | — | 
                                                301,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Reason for increase in number of shares | — | 
                                                脱炭素化を目的とした、大型蓄電池の製造事業等を営むスタートアップ企業への出資および最先端のAI・DX技術を擁し、海運事業に携わるスタートアップ企業への出資により増加。
                                                
                                             | 
| Number of issues whose number of shares decreased | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total sale amount for decreased shares | — | 
                                                24,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shares other than those not listed | ||
| Number of issues | 
                                                76
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Carrying amount | 
                                                73,425,000,000
                                                
                                                    
                                                        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 | — | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total sale amount for decreased shares | — | 
                                                1,474,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |