Quarterly Consolidated Balance Sheet
| Concept | As at 2024-03-31 | As at 2023-12-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                31,537,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,394,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                2,489,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,989,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,581,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,965,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                45,412,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,493,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                45,901,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,512,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                11,480,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,533,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                9,591,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,591,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                18,927,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,323,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                5,902,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,065,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Goodwill | 
                                                5,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,205,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                718,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                17,027,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,161,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                22,439,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                7,157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,214,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                760,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                848,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                245,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                323,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                85,368,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,375,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                130,780,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                125,869,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                269,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                646,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | 
                                                635,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                249,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                13,779,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,403,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                28,242,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,382,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                19,375,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,900,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | 
                                                707,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                691,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                4,168,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,156,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                529,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                296,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                53,782,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,665,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                82,025,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,048,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                17,830,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,830,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                26,767,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,767,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                2,975,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,698,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,115,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,122,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                46,457,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,173,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                2,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,648,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                2,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,648,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                48,755,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,821,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                130,780,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                125,869,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |