Semi-Annual Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,196,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,089,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                579,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                13,513,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,139,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                19,076,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,202,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                12,174,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,174,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                48,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                680,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                754,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                85,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                1,009,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,026,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                3,047,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,119,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                347,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                394,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                158,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                166,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                22,209,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,407,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                35,723,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,547,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                8,897,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,983,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                98,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                86,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,188,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,337,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                16,242,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,429,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                10,217,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,810,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Bonds payable | 
                                                23,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                7,719,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,122,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                715,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                717,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,617,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,781,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                26,459,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,240,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                2,902,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,902,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                3,435,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,435,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                2,400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,427,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -17,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                8,721,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,748,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                380,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                392,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                541,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                557,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                9,263,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,306,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                35,723,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,547,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |