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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, 2018
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]        
Deferred income tax assets ₩ 465,369 ₩ 359,949 ₩ 712,222 ₩ 701,409
Deferred income tax liabilities 204,785 ₩ 135,367 128,462 ₩ 137,680
Gross carrying amount [member]        
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]        
Deferred income tax assets 1,776,675   1,458,591  
Deferred income tax liabilities 1,516,091   874,831  
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 428,690   318,339  
Deferred income tax liabilities 413,409   15,705  
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 1,347,985   1,140,252  
Deferred income tax liabilities ₩ 1,102,682   ₩ 859,126