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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, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets ₩ 433,698 ₩ 424,856
Deferred income tax liabilities (429,331) (425,468)
Gross carrying amount [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets 2,036,193 2,033,725
Deferred income tax liabilities (2,031,826) (2,034,337)
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 404,434 419,889
Deferred income tax liabilities (637,317) (538,578)
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 1,631,759 1,613,836
Deferred income tax liabilities ₩ (1,394,509) ₩ (1,495,759)