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Deferred Income Tax and Income Tax Expense - Summary of Analysis of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets ₩ 712,222 ₩ 701,409
Deferred income tax liabilities 128,462 137,680
Gross carrying amount [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets 1,458,591 1,390,417
Deferred income tax liabilities (874,831) (826,688)
Gross carrying amount [member] | Less than 1 year [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets 318,339 265,997
Deferred income tax liabilities (15,705) (48,033)
Gross carrying amount [member] | Over 12 months [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets 1,140,252 1,124,420
Deferred income tax liabilities ₩ (859,126) ₩ (778,655)