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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | ₩ (5,198,946) | ₩ (7,367,101) |
Amounts recognized in profit or loss | 10,026,566 | 2,366,869 |
Amount recognized in other comprehensive income (loss) | (354,903) | (203,450) | ₩ 47,213
Amounts recognized directly in equity | 4,555 | 4,736 |
Ending balance | 4,477,272 | (5,198,946) | (7,367,101)
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 | (7,962,698) | (8,400,772) |
Amounts recognized in profit or loss | 896,758 | 636,788 |
Amount recognized in other comprehensive income (loss) | (354,903) | (203,450) |
Amounts recognized directly in equity | 4,555 | 4,736 |
Ending balance | (7,416,288) | (7,962,698) | (8,400,772)
Employee benefits |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 558,383 | 689,787 |
Amounts recognized in profit or loss | (36,341) | (4,514) |
Amount recognized in other comprehensive income (loss) | (322,489) | (126,890) |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 199,553 | 558,383 | 689,787
Cash flow hedges |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (49,947) | 15,587 |
Amounts recognized in profit or loss | (46,188) | (90,217) |
Amount recognized in other comprehensive income (loss) | 40,390 | 24,220 |
Amounts recognized directly in equity | 405 | 463 |
Ending balance | (55,340) | (49,947) | 15,587
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 | (8,721,320) | (8,668,015) |
Amounts recognized in profit or loss | 410,310 | 367 |
Amount recognized in other comprehensive income (loss) | (66,677) | (53,672) |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (8,377,687) | (8,721,320) | (8,668,015)
Property, plant and equipment |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (7,430,461) | (7,713,449) |
Amounts recognized in profit or loss | (111,177) | 282,988 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (7,541,638) | (7,430,461) | (7,713,449)
Finance lease |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (415,558) | (211,420) |
Amounts recognized in profit or loss | 9,919 | (204,138) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (405,639) | (415,558) | (211,420)
Intangible Assets |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (31,481) | (31,166) |
Amounts recognized in profit or loss | 6,550 | (315) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (24,931) | (31,481) | (31,166)
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 | 12 | 13 |
Amounts recognized in profit or loss | 3,445 | (1) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 3,457 | 12 | 13
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 | 27,381 | 37,950 |
Amounts recognized in profit or loss | 25,178 | (816) |
Amount recognized in other comprehensive income (loss) | (31,416) | (9,753) |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 21,143 | 27,381 | 37,950
Deferred revenue |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 186,391 | 199,701 |
Amounts recognized in profit or loss | (16,411) | (13,310) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 169,980 | 186,391 | 199,701
Provisions |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 6,494,314 | 5,916,803 |
Amounts recognized in profit or loss | 595,030 | 577,511 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 7,089,344 | 6,494,314 | 5,916,803
Doubtful receivables |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 801 | 0 |
Amounts recognized in profit or loss | 1,673 | 801 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 2,474 | 801 | 0
Other financial liabilities |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 31,410 | 30,399 |
Amounts recognized in profit or loss | (14,142) | (3,262) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 4,150 | 4,273 |
Ending balance | 21,418 | 31,410 | 30,399
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 | 91,411 | (11,635) |
Amounts recognized in profit or loss | 42,905 | 103,046 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 134,316 | 91,411 | (11,635)
Allowance for doubtful accounts |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 64,264 | 56,129 |
Amounts recognized in profit or loss | (6,029) | 8,135 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 58,235 | 64,264 | 56,129
Accrued income |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 10,002 | 8,944 |
Amounts recognized in profit or loss | 6,612 | 1,058 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 16,614 | 10,002 | 8,944
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 | (224,127) | (226,351) |
Amounts recognized in profit or loss | 8,968 | 2,224 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (215,159) | (224,127) | (226,351)
Others |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 1,445,827 | 1,505,951 |
Amounts recognized in profit or loss | 16,456 | (22,769) |
Amount recognized in other comprehensive income (loss) | 25,289 | (37,355) |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 1,487,572 | 1,445,827 | 1,505,951
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 | 2,763,752 | 1,033,671 |
Amounts recognized in profit or loss | 9,129,808 | 1,730,081 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 11,893,560 | 2,763,752 | 1,033,671
Unused tax losses |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 2,559,877 | 893,074 |
Amounts recognized in profit or loss | 9,102,228 | 1,666,803 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 11,662,105 | 2,559,877 | 893,074
Excess of donation limit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 69,185 | 35,181 |
Amounts recognized in profit or loss | 11,861 | 34,004 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 81,046 | 69,185 | 35,181
Tax credit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 134,690 | 105,416 |
Amounts recognized in profit or loss | 15,719 | 29,274 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | ₩ 150,409 | ₩ 134,690 | ₩ 105,416

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