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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows from (used in) operating activities [abstract] |  |  |
Reclassification of the current portion of borrowings | ₩ 1,731,998 | ₩ 1,004,818 | ₩ 1,303,543
Reclassification of construction-in-progress to property and equipment | 3,123,611 | 3,167,965 | 2,916,888
Reclassification of accounts payable from property and equipment | (293,448) | (7,055) | (149,512)
Reclassification of accounts payable from intangible assets | (276,491) | (197,389) | 524,040
Reclassification of payable from defined benefit liabilities | 26,246 | (32,417) | 69,415
Reclassification of payable from plan assets | ₩ (24,821) | 28,532 | ₩ (60,320)
Disposal of treasury stock related to acquisition of financial assets |  | 747,161 |
Acquisition of financial assets related to disposal of a subsidiary |  | ₩ 250,000 |

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- Definition Reclassification of payable from defined benefit liability + References No definition available. + Details
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- Definition Reclassification of payable from plan assets. + References No definition available. + Details
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