Shareholdings
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|
| Shareholdings | ||||
| Second largest holding company | ||||
| Details of deemed holdings of shares held for purposes other than pure investment | ||||
| Issue | 
                                                九州電力株式会社
                                                
                                             | 
                                                パナソニックホールディングス株式会社
                                                
                                             | — | — | 
| Number of shares | 
                                                2,581,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                157,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                2,581,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                157,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                3,553,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                227,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,954,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Purpose of shareholding, overview of business alliance, quantitative effects of shareholding and reason for increase in number of shares | 
                                                退職給付信託株式であり、当該株式に係る議決権行使の指図権限を有しております。
                                                
                                             | 
                                                退職給付信託株式であり、当該株式に係る議決権行使の指図権限を有しております。
                                                
                                             | — | — | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                有
                                                
                                             | 
                                                無
                                                
                                             | — | — |