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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets and liabilities [abstract]      
Profit before income tax expense ₩ 1,019,334 ₩ 1,033,977 ₩ 816,997
Statutory income tax expense 269,955 273,982 197,251
Tax effect      
Income not taxable for taxation purposes (1,265) (85,322) (19,268)
Non-deductible expenses 19,543 18,126 39,746
Tax credit (39,190) (20,319) (27,211)
Additional payment of income taxes 3,832 11,439 976
Tax effect and adjustment on consolidation      
Goodwill impairment 159 137 20,475
Eliminated dividend income form subsidiaries 21,917 31,966 34,305
Changes of out-side tax effect 13,539 618 17,990
Tax effect of investment in kind   82,820  
Intangible Asset impairment and amortization 14,052    
Reversal expenses of contract cost assets 11,213    
Others 6,305 1,118 6,392
Income tax expense ₩ 320,060 ₩ 314,565 ₩ 270,656