Shareholdings
| Concept | As at 2024-12-31 | As at 2023-12-31 | 
|---|---|---|
| Shareholdings | ||
| Reporting company | ||
| Details of specified investment shares held for purposes other than pure investment | ||
| Issue | 
                                                ENECHANGE株式会社
                                                
                                             | — | 
| Number of shares | 
                                                480,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                480,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Carrying amount | 
                                                171,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                496,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Purpose of shareholding, overview of business alliance, quantitative effects of shareholding and reason for increase in number of shares | 
                                                当社の重要な取引先であり、当社の全てのセグメントにおいて取引関係があります。同社との取引関係強化のため保有しております。なお、定量的な保有効果については記載が困難であるため記載しておりません。
                                                
                                             | — | 
| Whether issuer of aforementioned shares holds reporting company's shares | 
                                                無
                                                
                                             | — |