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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | ₩ 4,477,272 | ₩ (5,198,946) |
Amounts recognized in profit or loss | 3,427,690 | 10,026,566 |
Amount recognized in other comprehensive income (loss) | 93,705 | (354,903) | ₩ (203,450)
Amounts recognized directly in equity | 0 | 4,555 |
Ending balance | 7,998,667 | 4,477,272 | (5,198,946)
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 | (7,416,288) | (7,962,698) |
Amounts recognized in profit or loss | 1,733,121 | 896,758 |
Amount recognized in other comprehensive income (loss) | 93,705 | (354,903) |
Amounts recognized directly in equity | 0 | 4,555 |
Ending balance | (5,589,462) | (7,416,288) | (7,962,698)
Employee benefits |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 199,553 | 558,383 |
Amounts recognized in profit or loss | 6,597 | (36,341) |
Amount recognized in other comprehensive income (loss) | 133,134 | (322,489) |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 339,284 | 199,553 | 558,383
Cash flow hedges |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (55,340) | (49,947) |
Amounts recognized in profit or loss | 29,622 | (46,188) |
Amount recognized in other comprehensive income (loss) | 4,863 | 40,390 |
Amounts recognized directly in equity | 0 | 405 |
Ending balance | (20,855) | (55,340) | (49,947)
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 | (8,377,687) | (8,721,320) |
Amounts recognized in profit or loss | 1,300,263 | 410,310 |
Amount recognized in other comprehensive income (loss) | (40,213) | (66,677) |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (7,117,637) | (8,377,687) | (8,721,320)
Property, plant and equipment |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (7,541,638) | (7,430,461) |
Amounts recognized in profit or loss | 534,361 | (111,177) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (7,007,277) | (7,541,638) | (7,430,461)
Finance lease |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (405,639) | (415,558) |
Amounts recognized in profit or loss | 179,943 | 9,919 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (225,696) | (405,639) | (415,558)
Intangible Assets |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | (24,931) | (31,481) |
Amounts recognized in profit or loss | 1,526 | 6,550 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (23,405) | (24,931) | (31,481)
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 | 3,457 | 12 |
Amounts recognized in profit or loss | (5,199) | 3,445 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (1,742) | 3,457 | 12
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 | 21,143 | 27,381 |
Amounts recognized in profit or loss | 16,839 | 25,178 |
Amount recognized in other comprehensive income (loss) | (10,624) | (31,416) |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 27,358 | 21,143 | 27,381
Deferred revenue |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 169,980 | 186,391 |
Amounts recognized in profit or loss | (13,580) | (16,411) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 156,400 | 169,980 | 186,391
Provisions |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 7,089,344 | 6,494,314 |
Amounts recognized in profit or loss | (47,684) | 595,030 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 7,041,660 | 7,089,344 | 6,494,314
Doubtful receivables |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 2,474 | 801 |
Amounts recognized in profit or loss | (74) | 1,673 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 2,400 | 2,474 | 801
Other financial liabilities |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 21,418 | 31,410 |
Amounts recognized in profit or loss | (3,426) | (14,142) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 4,150 |
Ending balance | 17,992 | 21,418 | 31,410
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 | 134,316 | 91,411 |
Amounts recognized in profit or loss | (6,306) | 42,905 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 128,010 | 134,316 | 91,411
Allowance for doubtful accounts |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 58,235 | 64,264 |
Amounts recognized in profit or loss | (2,492) | (6,029) |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 55,743 | 58,235 | 64,264
Accrued income |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 16,614 | 10,002 |
Amounts recognized in profit or loss | 17,321 | 6,612 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 33,935 | 16,614 | 10,002
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 | (215,159) | (224,127) |
Amounts recognized in profit or loss | 3,299 | 8,968 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | (211,860) | (215,159) | (224,127)
Others |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 1,487,572 | 1,445,827 |
Amounts recognized in profit or loss | (277,889) | 16,456 |
Amount recognized in other comprehensive income (loss) | 6,545 | 25,289 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 1,216,228 | 1,487,572 | 1,445,827
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 | 11,893,560 | 2,763,752 |
Amounts recognized in profit or loss | 1,694,569 | 9,129,808 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 13,588,129 | 11,893,560 | 2,763,752
Unused tax losses |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 11,662,105 | 2,559,877 |
Amounts recognized in profit or loss | 1,676,638 | 9,102,228 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 13,338,743 | 11,662,105 | 2,559,877
Excess of donation limit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 81,046 | 69,185 |
Amounts recognized in profit or loss | (34,724) | 11,861 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | 46,322 | 81,046 | 69,185
Tax credit |  |  |
Deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences [Line Items] |  |  |
Beginning balance | 150,409 | 134,690 |
Amounts recognized in profit or loss | 52,665 | 15,719 |
Amount recognized in other comprehensive income (loss) | 0 | 0 |
Amounts recognized directly in equity | 0 | 0 |
Ending balance | ₩ 203,064 | ₩ 150,409 | ₩ 134,690

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