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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, 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