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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from (used in) operating activities [abstract] |  |  |
Reclassification of the current portion of borrowings | ₩ 1,030,056 | ₩ 1,149,599 | ₩ 1,416,066
Reclassification of construction-in-progress to property and equipment | 2,698,146 | 1,988,014 | 2,686,591
Reclassification of accounts payable from property and equipment | 685,859 | 122,185 | 225,601
Reclassification of accounts payable from intangible assets | (356,911) | 584,595 | (227,108)
Reclassification of payable from defined benefit liability | (19,053) | (31,838) | 36,209
Reclassification of payable from plan assets | ₩ (14,298) | ₩ (9,497) | ₩ 43,035

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