Notes - Segment Information, Etc.
| Concept | 2023-04-01 to 2023-12-31 | 2023-04-01 to 2023-12-31 | 2023-04-01 to 2023-12-31 | 2023-04-01 to 2023-12-31 | 2023-04-01 to 2023-12-31 | 2023-04-01 to 2023-12-31 | 2022-04-01 to 2022-12-31 | 2022-04-01 to 2022-12-31 | 2022-04-01 to 2022-12-31 | 2022-04-01 to 2022-12-31 | 2022-04-01 to 2022-12-31 | 2022-04-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information, etc. | ||||||||||||
| Segment information | ||||||||||||
| Disclosure of sales, profit (loss), asset, liability, and other items for each reportable segment | ||||||||||||
| Sales | ||||||||||||
| Revenues from external customers | 
                                                18,345,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,103,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                758,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,328,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,017,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,954,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,207,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,892,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,161,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                730,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                305,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                305,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -305,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -148,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                148,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                148,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |