Semi-Annual Consolidated Statement Of Cash Flows
| Concept | As at 2024-03-31 | 2024-01-01 to 2024-03-31 | As at 2023-12-31 | 2023-01-01 to 2023-03-31 | As at 2023-03-31 | As at 2022-12-31 | 
|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | ||||||
| Statement of cash flows | ||||||
| Cash flows from operating activities | ||||||
| Subtotal | — | 
                                                3,395,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest and dividends received | — | 
                                                10,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Interest paid | — | 
                                                -277,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -308,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes paid | — | 
                                                -548,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -522,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) operating activities | — | 
                                                2,580,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,540,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from investing activities | ||||||
| Purchase of property, plant and equipment | — | 
                                                -1,460,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -592,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                55,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                53,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -1,579,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -639,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash flows from financing activities | ||||||
| Proceeds from long-term borrowings | — | 
                                                8,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Repayments of long-term borrowings | — | 
                                                -1,925,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -875,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividends paid | — | 
                                                -1,249,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -752,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                4,147,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,091,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other, net | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net increase (decrease) in cash and cash equivalents | — | 
                                                5,148,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,993,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                31,554,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                26,406,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                28,653,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,660,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |