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Income Taxes - Summary of Changes in Deferred Income Tax Assets (Liabilities) (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | ₩ (7,367,101) | ₩ (7,126,946) |
Amounts recognized in profit or loss | 2,366,869 | (291,641) |
Amount recognized in other comprehensive income (loss) | (203,450) | 47,213 | ₩ (56,733)
Amounts recognized directly in equity | 4,736 | 4,273 |
Ending balance | (5,198,946) | (7,367,101) | (7,126,946)
Deferred income tax on temporary differences |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (8,400,772) | (8,382,980) |
Amounts recognized in profit or loss | 636,788 | (69,278) |
Amount recognized in other comprehensive income (loss) | (203,450) | 47,213 |
Amounts recognized directly in equity | 4,736 | 4,273 |
Ending balance | (7,962,698) | (8,400,772) | (8,382,980)
Employee benefits |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 689,787 | 648,847 |
Amounts recognized in profit or loss | (4,514) | 14,566 |
Amount recognized in other comprehensive income (loss) | (126,890) | 26,374 |
Ending balance | 558,383 | 689,787 | 648,847
Cash flow hedges |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 15,587 | (999) |
Amounts recognized in profit or loss | (90,217) | 63,817 |
Amount recognized in other comprehensive income (loss) | 24,220 | (47,231) |
Amounts recognized directly in equity | 463 |  |
Ending balance | (49,947) | 15,587 | (999)
Investments in subsidiaries, associates and joint ventures |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (8,668,015) | (8,665,727) |
Amounts recognized in profit or loss | 367 | (38,002) |
Amount recognized in other comprehensive income (loss) | (53,672) | 35,714 |
Ending balance | (8,721,320) | (8,668,015) | (8,665,727)
Property, plant and equipment |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (7,713,449) | (7,115,218) |
Amounts recognized in profit or loss | 282,988 | (598,231) |
Ending balance | (7,430,461) | (7,713,449) | (7,115,218)
Finance lease |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (211,420) | (160,443) |
Amounts recognized in profit or loss | (204,138) | (50,977) |
Ending balance | (415,558) | (211,420) | (160,443)
Intangible Assets |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (31,166) | (55,906) |
Amounts recognized in profit or loss | (315) | 24,740 |
Ending balance | (31,481) | (31,166) | (55,906)
Financial assets at fair value through profit or loss |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 13 | 341 |
Amounts recognized in profit or loss | (1) | (328) |
Ending balance | 12 | 13 | 341
Financial assets at fair value through other comprehensive income |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 37,950 | 18,245 |
Amounts recognized in profit or loss | (816) | 258 |
Amount recognized in other comprehensive income (loss) | (9,753) | 19,447 |
Ending balance | 27,381 | 37,950 | 18,245
Deferred revenue |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 199,701 | 213,003 |
Amounts recognized in profit or loss | (13,310) | (13,302) |
Ending balance | 186,391 | 199,701 | 213,003
Provisions |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 5,916,803 | 5,456,919 |
Amounts recognized in profit or loss | 577,511 | 459,884 |
Ending balance | 6,494,314 | 5,916,803 | 5,456,919
Doubtful receivables |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 0 | 59 |
Amounts recognized in profit or loss | 801 | (59) |
Ending balance | 801 | 0 | 59
Other financial liabilities |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 30,399 | 39,364 |
Amounts recognized in profit or loss | (3,262) | (13,238) |
Amounts recognized directly in equity | 4,273 | 4,273 |
Ending balance | 31,410 | 30,399 | 39,364
Gains or losses on foreign exchange translation |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (11,635) | 57,961 |
Amounts recognized in profit or loss | 103,046 | (69,596) |
Ending balance | 91,411 | (11,635) | 57,961
Allowance for doubtful accounts |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 56,129 | 57,607 |
Amounts recognized in profit or loss | 8,135 | (1,478) |
Ending balance | 64,264 | 56,129 | 57,607
Accrued income |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 8,944 | (4,376) |
Amounts recognized in profit or loss | 1,058 | 13,320 |
Ending balance | 10,002 | 8,944 | (4,376)
Special deduction for property, plant and equipment |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (226,351) | (215,373) |
Amounts recognized in profit or loss | 2,224 | (10,978) |
Ending balance | (224,127) | (226,351) | (215,373)
Others |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 1,505,951 | 1,342,716 |
Amounts recognized in profit or loss | (22,769) | 150,326 |
Amount recognized in other comprehensive income (loss) | (37,355) | 12,909 |
Ending balance | 1,445,827 | 1,505,951 | 1,342,716
Deferred income tax on unused tax losses and tax credit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 1,033,671 | 1,256,034 |
Amounts recognized in profit or loss | 1,730,081 | (222,363) |
Ending balance | 2,763,752 | 1,033,671 | 1,256,034
Unused tax losses |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 893,074 | 1,111,813 |
Amounts recognized in profit or loss | 1,666,803 | (218,739) |
Ending balance | 2,559,877 | 893,074 | 1,111,813
Excess of donation limit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 35,181 | 36,695 |
Amounts recognized in profit or loss | 34,004 | (1,514) |
Ending balance | 69,185 | 35,181 | 36,695
Tax credit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 105,416 | 107,526 |
Amounts recognized in profit or loss | 29,274 | (2,110) |
Ending balance | ₩ 134,690 | ₩ 105,416 | ₩ 107,526

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