Notes - Segment Information, Etc.
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                9,265,110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,265,110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,165,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,025,083,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,025,083,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,400,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,003,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -21,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                65,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments in entities accounted for using equity method | 
                                                1,310,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,310,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,294,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,303,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,303,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,245,516,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                26,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,603,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |