| Concept | 2022-04-01 to 2023-03-31 | 2021-04-01 to 2022-03-31 | 
|---|---|---|
| Audits | ||
| Fees to primary auditor | ||
| Audit fees - Reporting company | 
                                                71,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-audit fees - Reporting company | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Audit fees - Consolidated subsidiaries | 
                                                171,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                178,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-audit fees - Consolidated subsidiaries | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Audit fees - Total | 
                                                243,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                246,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-audit fees - Total | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Fees to network firms | ||
| Audit fees - Reporting company | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-audit fees - Reporting company | 
                                                2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Audit fees - Consolidated subsidiaries | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-audit fees - Consolidated subsidiaries | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Audit fees - Total | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-audit fees - Total | 
                                                3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |