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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, 2019
Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets ₩ 424,856 ₩ 465,369
Deferred income tax liabilities (425,468) (204,785)
Gross carrying amount [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deferred income tax assets 2,033,725 1,776,675
Deferred income tax liabilities (2,034,337) (1,516,091)
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 419,889 428,690
Deferred income tax liabilities (538,578) (413,409)
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 1,613,836 1,347,985
Deferred income tax liabilities ₩ (1,495,759) ₩ (1,102,682)