Consolidated Statement Of Cash Flows
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|
| Consolidated statement of cash flows | |||||
| Statement of cash flows | |||||
| Cash flows from operating activities | |||||
| Subtotal | — | 
                                                14,201,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                249,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                198,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -131,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -70,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -5,421,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,835,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                8,897,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,798,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | |||||
| Purchase of property, plant and equipment | — | 
                                                -8,712,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,043,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of property, plant and equipment | — | 
                                                101,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                306,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -10,606,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,864,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of investment securities | — | 
                                                -34,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -204,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from sale of investment securities | — | 
                                                835,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of shares of subsidiaries resulting in change in scope of consolidation | — | 
                                                -1,249,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Loan advances | — | 
                                                -8,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from collection of loans receivable | — | 
                                                34,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                34,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                269,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | |||||
| Proceeds from short-term borrowings | — | 
                                                448,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from issuance of shares | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,894,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of short-term borrowings | — | 
                                                -451,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Purchase of treasury shares | — | 
                                                -240,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -4,192,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,375,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Proceeds from long-term borrowings | — | 
                                                7,600,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid to non-controlling interests | — | 
                                                -113,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -155,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -5,708,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,247,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -3,035,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,581,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                -21,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -35,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                -4,744,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,515,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                41,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                45,880,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,365,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |