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Cash Generated from Operations - Summary of Significant Transactions not Affecting Cash Flows (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from (used in) operating activities [abstract]      
Reclassification of the current portion of borrowings ₩ 1,229,359 ₩ 1,030,056 ₩ 1,149,599
Reclassification of construction-in-progress to property and equipment 3,011,519 2,698,146 1,988,014
Reclassification of accounts payable from property and equipment 22,052 685,859 122,185
Reclassification of accounts payable from intangible assets (345,675) (356,911) 584,595
Reclassification of payable from defined benefit liability 72,346 (19,053) (31,838)
Reclassification of payable from plan assets ₩ 66,046 ₩ (14,298) ₩ (9,497)