Quarterly Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                25,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,519,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                26,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                38,062,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,433,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                13,802,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,829,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Other | — | — | 
| Other, net | 
                                                3,297,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,421,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                361,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                376,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Investments and other assets | 
                                                53,699,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,197,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Long-term prepaid expenses | 
                                                142,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                173,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                19,855,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,897,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                112,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                67,863,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,403,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                105,925,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                107,837,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                20,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                24,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,623,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,926,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                54,956,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                61,378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                9,625,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                443,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                439,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                688,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,002,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                23,310,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,541,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                78,267,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                18,353,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,353,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                9,015,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,726,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                27,468,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,179,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Deferred gains or losses on hedges | 
                                                189,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -262,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                189,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -262,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                27,658,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,917,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                105,925,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                107,837,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |