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Cash Generated from Operations - Summary of Significant Transactions not Affecting Cash Flows (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Cash flows from (used in) operating activities [abstract] |  |  |
Reclassification of the current portion of borrowings | ₩ 3,046,361 | ₩ 1,731,998 | ₩ 1,004,818
Reclassification of construction-in-progress to property and equipment | 2,324,080 | 3,123,611 | 3,167,965
Reclassification of accounts payable from property and equipment | 245,099 | (293,448) | (7,055)
Reclassification of accounts payable from intangible assets | (291,574) | (276,491) | (197,389)
Reclassification of payable from defined benefit liabilities | 64,103 | 26,246 | (32,417)
Reclassification of payable from plan assets | (64,281) | (24,821) | 28,532
Disposal of treasury stock related to acquisition of financial assets | 0 | 0 | 747,161
Acquisition of financial assets related to disposal of a subsidiary | 0 | 0 | 250,000
Increase In Financial Assets Due To Stock Exchange | ₩ 52,841 | ₩ 0 | ₩ 0

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