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Deferred Income Tax and Income Tax Expense - Summary of Tax Impacts Recognized Directly To Equity (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets and liabilities [abstract]      
Gain on valuation of financial assets at fair value through other comprehensive income, Before recognition ₩ 54,969 ₩ 225,635 ₩ 59,384
Gain (loss) on valuation of hedge instruments (loss)liabilities, Before recognition 37,247 31,003 (36,756)
Remeasurements of net defined benefit liabilities, Before recognition (77,382) (33,814) (116,324)
Share of Gain (loss) of associates and joint ventures, and others, Before recognition 25,538 4,493 (1,036)
Exchange differences on translation for foreign operations, Before recognition (3,614) 6,692 3,989
Total, Before recognition 36,758 234,009 (90,743)
Gain on valuation of financial assets at fair value through other comprehensive income, Tax effect (12,972) (58,483) (15,573)
Gain (loss) on valuation of hedge instruments (loss)liabilities, Tax effect (9,860) (8,139) 9,745
Remeasurements of net defined benefit liabilities, Tax effect 17,201 8,037 42,813
Share of Gain (loss) of associates and joint ventures, and others, Tax effect (8,820) (1,327) 179
Exchange differences on translation for foreign operations, Tax effect 948 (1,759) (1,049)
Total, Tax effect 77,103 (61,669) 36,115
Gain on valuation of financial assets at fair value through other comprehensive income, After recognition 41,997 167,152 43,811
Gain (loss) on valuation of hedge instruments (loss)liabilities, After recognition 27,387 22,864 (27,011)
Remeasurements of net defined benefit liabilities, After recognition (60,181) (25,777) (73,511)
Share of Gain (loss) of associates and joint ventures, and others, After recognition 16,718 3,166 (857)
Exchange differences on translation for foreign operations, After recognition (2,666) 4,933 2,940
Total other comprehensive income (loss) ₩ 23,255 ₩ 172,338 ₩ (54,628)