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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from (used in) operating activities [abstract] |  |  |
Reclassification of the current portion of debentures | ₩ 1,416,066 | ₩ 1,617,175 | ₩ 1,551,300
Reclassification of construction-in-progress to property, plant and equipment | 2,686,591 | 2,212,324 | 2,373,023
Reclassification of accounts payable from property, plant and equipment | 225,601 | 91,407 | 78,663
Reclassification of accounts payable from intangible assets | (227,108) | 668,564 | (170,870)
Reclassification of payable from defined benefit liability | 36,209 | 5,746 | 1,675
Reclassification of payable from plan assets | ₩ 43,035 | ₩ (9,731) | ₩ 13,717

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