Semi-Annual Consolidated Statement Of Cash Flows
| Concept | 2024-01-01 to 2024-06-30 | As at 2024-06-30 | 2023-01-01 to 2023-12-31 | As at 2023-12-31 | As at 2022-12-31 | 2022-01-01 to 2022-12-31 | As at 2021-12-31 | 
|---|---|---|---|---|---|---|---|
| Semi-annual consolidated statement of cash flows | |||||||
| Statement of cash flows | |||||||
| Cash flows from operating activities | |||||||
| Subtotal | 
                                                3,146,711,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,932,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,860,033,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest and dividends received | 
                                                61,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Interest paid | 
                                                -14,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -23,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -15,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Income taxes paid | 
                                                -409,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -804,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,073,554,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | 
                                                2,723,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,104,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,776,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from investing activities | |||||||
| Purchase of property, plant and equipment | 
                                                -493,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -678,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -606,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Proceeds from sale of property, plant and equipment | 
                                                14,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
| Proceeds from sale of investment securities | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                159,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Other, net | 
                                                -37,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -85,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -61,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | 
                                                -598,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,012,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -747,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from financing activities | |||||||
| Proceeds from long-term borrowings | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,975,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Repayments of long-term borrowings | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -722,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Purchase of treasury shares | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -3,975,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Dividends paid | 
                                                -896,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -311,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -382,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | 
                                                -962,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -585,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,393,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Effect of exchange rate change on cash and cash equivalents | 
                                                -8,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                30,693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                75,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net increase (decrease) in cash and cash equivalents | 
                                                1,153,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                536,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                712,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | 
                                                7,451,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,268,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,731,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,718,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |