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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash flows from (used in) operating activities [abstract] |  |  |
Reclassification of the current portion of borrowings | ₩ 1,004,818 | ₩ 1,303,543 | ₩ 1,229,359
Reclassification of construction-in-progress to property and equipment | 3,167,965 | 2,916,888 | 3,011,519
Reclassification of accounts payable from property and equipment | (7,055) | (149,512) | 22,052
Reclassification of accounts payable from intangible assets | (197,389) | 524,040 | (345,675)
Reclassification of payable from defined benefit liabilities | (32,417) | 69,415 | 72,346
Reclassification of payable from plan assets | 28,532 | ₩ (60,320) | ₩ 66,046
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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