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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets and liabilities [abstract]      
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, Before recognition ₩ (216,862) ₩ 163,892 ₩ 54,969
Gain (loss) on valuation of hedge instruments (loss) liabilities, Before recognition (42,510) 6,916 37,247
Remeasurements of net defined benefit liabilities, Before recognition 247,162 74,518 (77,382)
Share of Gain (loss) of associates and joint ventures, and others, Before recognition (14,931) (34,909) 25,538
Exchange differences on translation for foreign operations, Before recognition 23,316 683 (3,614)
Gain or loss on disposal of treasury stock, Before recognition (59,308) (15,657) (27,786)
Total, Before recognition (63,133) 195,443 8,972
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, Tax effect 58,288 (34,112) (12,972)
Gain (loss) on valuation of hedge instruments (loss) liabilities, Tax effect 11,180 (1,644) (9,860)
Remeasurements of net defined benefit liabilities, Tax effect (65,733) (18,696) 17,201
Share of Gain (loss) of associates and joint ventures, and others, Tax effect 3,748 9,097 (8,820)
Exchange differences on translation for foreign operations, Tax effect (5,852) (178) 948
Gain or loss on disposal of treasury stock, Tax effect 14,886 4,080 7,288
Total, Tax effect 16,517 (41,453) (6,215)
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, After recognition (158,574) 129,780 41,997
Gain (loss) on valuation of hedge instruments (loss) liabilities, After recognition (31,330) 5,272 27,387
Remeasurements of net defined benefit liabilities, After recognition 181,429 55,822 (60,181)
Share of Gain (loss) of associates and joint ventures, and others, After recognition (11,183) (25,812) 16,718
Exchange differences on translation for foreign operations, After recognition 17,464 505 (2,666)
Gain or loss on disposal of treasury stock, After recognition (44,422) (11,577) (20,498)
Total other comprehensive income ₩ (46,616) ₩ 153,990 ₩ 2,757