Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                25,326,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,909,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                56,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                38,801,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,473,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                14,864,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,899,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Other | — | — | 
| Other, net | 
                                                5,334,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,673,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                174,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                281,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                47,791,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,136,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Deferred tax assets | 
                                                18,123,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,067,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                62,829,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,317,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                101,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                110,790,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                20,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                16,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,944,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,291,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                53,046,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,019,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                8,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                447,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                445,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                622,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                653,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                26,280,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,913,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                79,327,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                82,932,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                962,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                18,349,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,353,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                6,121,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,421,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,377,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,393,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                23,192,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,481,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Deferred gains or losses on hedges | 
                                                -888,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                -888,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                22,304,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,857,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                101,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                110,790,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |