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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets and liabilities [abstract]      
Profit before income tax expense ₩ 1,031,605 ₩ 1,015,928 ₩ 1,033,977
Statutory income tax expense 273,329 269,018 273,982
Tax effect      
Income not taxable for taxation purposes (24,657) (1,265) (85,322)
Non-deductible expenses 31,741 19,543 18,126
Tax credit (47,056) (39,190) (20,319)
Additional payment of income taxes 429 3,832 11,439
Tax effect and adjustment on consolidation      
Goodwill impairment   159 137
Eliminated dividend income form subsidiaries 20,682 21,917 31,966
Changes of out-side tax effect 38,552 13,539 618
Tax effect of investment in kind     82,820
Intangible Asset impairment and amortization 3,790 14,052  
Reversal expenses of contract cost assets (6,643) 11,213  
Others (4,818) 7,242 1,118
Income tax expense ₩ 285,349 ₩ 320,060 ₩ 314,565