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Financial Income and Costs - Summary of Details of Financial Expense (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Finance Income [line items]      
Interest expenses ₩ 268,225 ₩ 296,874 ₩ 302,464
Loss on foreign currency transactions 30,267 49,156 40,303
Loss on foreign currency translation 93,977 72,642 12,239
Loss on settlement of derivatives 20   58,569
Loss on valuation of derivatives 15,867 2,045 209,582
Others 2,277 1,124 1,010
Total 421,931 435,659 644,531
Loans and receivables [member]      
Disclosure Of Finance Income [line items]      
Loss on disposal of trade receivables ₩ 11,298 ₩ 13,818 20,355
Available-for-sale [member]      
Disclosure Of Finance Income [line items]      
Impairment loss on available-for-sale financial assets     ₩ 9