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Classification of Financial Instruments - Classification of Financial Assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of financial assets [line items] |  |  |  |
Cash and cash equivalents | ₩ 2,382,979 | ₩ 4,342,887 | ₩ 3,234,780 | ₩ 2,635,238
Categories of current financial assets |  |  |  |
Current financial assets at fair value through profit or loss | 1,456,895 | 2,054,021 |  |
Current financial assets at amortized costs | 20,418 | 28,905 |  |
Current Derivative assets | 760,554 | 307,732 |  |
Other financial assets | 1,256,850 | 716,739 |  |
Trade and other receivables | 12,216,216 | 11,985,735 |  |
Total current financial assets And Cash and cash equivalents | 18,093,912 | 19,436,019 |  |
Categories of Non-current Financial assets |  |  |  |
Non-current financial assets at fair value through profit or loss | 719,277 | 657,264 |  |
Non-current financial assets at fair value through other comprehensive income | 674,850 | 502,443 |  |
Non-current financial assets at amortized costs | 9,815 | 9,938 |  |
Non-current Derivative assets | 1,930,610 | 692,662 |  |
Other financial assets | 1,611,438 | 1,683,907 |  |
Trade and other receivables | 3,157,409 | 2,193,587 |  |
Total non-current financial assets | 8,103,399 | 5,739,801 |  |
Total financial assets | 26,197,311 | 25,175,820 |  |
Financial assets at fair value through profit or loss |  |  |  |
Categories of current financial assets |  |  |  |
Current financial assets at fair value through profit or loss | 1,456,895 | 2,054,021 |  |
Categories of Non-current Financial assets |  |  |  |
Non-current financial assets at fair value through profit or loss | 564,235 | 490,589 |  |
Financial assets at fair value through profit or loss | At fair value [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Categories of current financial assets |  |  |  |
Current financial assets at fair value through profit or loss | 1,456,895 | 2,054,021 |  |
Current financial assets at amortized costs | 0 | 0 |  |
Current Derivative assets | 396,477 | 227,434 |  |
Other financial assets | 0 | 0 |  |
Trade and other receivables | 0 | 0 |  |
Total current financial assets And Cash and cash equivalents | 1,853,372 | 2,281,455 |  |
Categories of Non-current Financial assets |  |  |  |
Non-current financial assets at fair value through profit or loss | 719,277 | 657,264 |  |
Non-current financial assets at fair value through other comprehensive income | 0 | 0 |  |
Non-current financial assets at amortized costs | 0 | 0 |  |
Non-current Derivative assets | 1,450,050 | 503,514 |  |
Other financial assets | 0 | 0 |  |
Trade and other receivables | 0 | 0 |  |
Total non-current financial assets | 2,169,327 | 1,160,778 |  |
Total financial assets | 4,022,699 | 3,442,233 |  |
Financial assets at fair value through other comprehensive income | At fair value [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Categories of current financial assets |  |  |  |
Current financial assets at fair value through profit or loss | 0 | 0 |  |
Current financial assets at amortized costs | 0 | 0 |  |
Current Derivative assets | 0 | 0 |  |
Other financial assets | 0 | 0 |  |
Trade and other receivables | 0 | 0 |  |
Total current financial assets And Cash and cash equivalents | 0 | 0 |  |
Categories of Non-current Financial assets |  |  |  |
Non-current financial assets at fair value through profit or loss | 0 | 0 |  |
Non-current financial assets at fair value through other comprehensive income | 674,850 | 502,443 |  |
Non-current financial assets at amortized costs | 0 | 0 |  |
Non-current Derivative assets | 0 | 0 |  |
Other financial assets | 0 | 0 |  |
Trade and other receivables | 0 | 0 |  |
Total non-current financial assets | 674,850 | 502,443 |  |
Total financial assets | 674,850 | 502,443 |  |
Financial assets at amortized cost | At amortized cost [member] |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Cash and cash equivalents | 2,382,979 | 4,342,887 |  |
Categories of current financial assets |  |  |  |
Current financial assets at fair value through profit or loss | 0 | 0 |  |
Current financial assets at amortized costs | 20,418 | 28,905 |  |
Current Derivative assets | 0 | 0 |  |
Other financial assets | 1,256,850 | 716,739 |  |
Trade and other receivables | 12,216,216 | 11,985,735 |  |
Total current financial assets And Cash and cash equivalents | 15,876,463 | 17,074,266 |  |
Categories of Non-current Financial assets |  |  |  |
Non-current financial assets at fair value through profit or loss | 0 | 0 |  |
Non-current financial assets at fair value through other comprehensive income | 0 | 0 |  |
Non-current financial assets at amortized costs | 9,815 | 9,938 |  |
Non-current Derivative assets | 0 | 0 |  |
Other financial assets | 1,611,438 | 1,683,907 |  |
Trade and other receivables | 3,157,409 | 2,193,587 |  |
Total non-current financial assets | 4,778,662 | 3,887,432 |  |
Total financial assets | 20,655,125 | 20,961,698 |  |
Derivative assets (applying hedge accounting) |  |  |  |
Disclosure of financial assets [line items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Categories of current financial assets |  |  |  |
Current financial assets at fair value through profit or loss | 0 | 0 |  |
Current financial assets at amortized costs | 0 | 0 |  |
Current Derivative assets | 364,077 | 80,298 |  |
Other financial assets | 0 | 0 |  |
Trade and other receivables | 0 | 0 |  |
Total current financial assets And Cash and cash equivalents | 364,077 | 80,298 |  |
Categories of Non-current Financial assets |  |  |  |
Non-current financial assets at fair value through profit or loss | 0 | 0 |  |
Non-current financial assets at fair value through other comprehensive income | 0 | 0 |  |
Non-current financial assets at amortized costs | 0 | 0 |  |
Non-current Derivative assets | 480,560 | 189,148 |  |
Other financial assets | 0 | 0 |  |
Trade and other receivables | 0 | 0 |  |
Total non-current financial assets | 480,560 | 189,148 |  |
Total financial assets | ₩ 844,637 | ₩ 269,446 |  |

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