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 | 
                                                70,550,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,550,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,405,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,574,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,802,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                768,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                687,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,197,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,197,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,356,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,693,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,460,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                1,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                91,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                92,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                117,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,048,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,028,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,171,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,171,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |