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 | 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 | 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 | 
                                                1,683,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,331,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,212,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                402,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,676,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,187,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,804,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                382,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,187,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                471,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                471,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -471,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                523,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                524,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -524,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |