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Deferred Income Tax and Income Tax Expense - Summary of Tax on the Group's Profit Before Tax (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets and liabilities [abstract]      
Profit before income tax expense ₩ 816,997 ₩ 1,123,431 ₩ 710,741
Statutory income tax expense 197,251 271,870 171,999
Tax effect      
Income not taxable for taxation purposes (19,268) (28,093) (21,881)
Non-deductible expenses 39,746 21,947 28,849
Tax credit (27,211) (13,764) (9,660)
Additional payment of income taxes 976 (4,780) 997
Tax effect and adjustment on consolidation      
Goodwill impairment 20,475 31,847 23,185
Eliminated dividend income form subsidiaries 34,305 40,087 20,452
Changes of out-side tax effect 17,990 (567) 9,844
Others 6,392 9,767 3,346
Income tax expense ₩ 270,656 ₩ 328,314 ₩ 227,131