Notes - Goodwill And Intangible Assets
| Concept | 
                                    
                                        As at 2024-09-30  | 
                            
                                
                                    
                                        As at 2024-03-31  | 
                            
                        
|---|---|---|
| Notes - Goodwill and intangible assets | ||
| Components of goodwill and intangible assets | ||
| Carrying amount | ||
| Goodwill and intangible assets | 
                                        
                                             
                                                8,037,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     | 
                                
                                    
                                        
                                             
                                                8,231,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             
                                        
                                     |