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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets and liabilities [abstract]      
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, Before recognition ₩ 163,750 ₩ (216,862) ₩ 163,892
Gain (loss) on valuation of hedge instruments (loss) liabilities, Before recognition (30,168) (42,510) 6,916
Remeasurements of net defined benefit liabilities, Before recognition (179,129) 247,162 74,518
Share of Gain (loss) of associates and joint ventures, and others, Before recognition 28,715 (14,931) (34,909)
Exchange differences on translation for foreign operations, Before recognition 32,376 23,316 683
Gain or loss on disposal of treasury stock, Before recognition 402 (59,308) (15,657)
Total, Before recognition 15,946 (63,133) 195,443
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, Tax effect (41,945) 58,288 (34,112)
Gain (loss) on valuation of hedge instruments (loss) liabilities, Tax effect 7,555 11,180 (1,644)
Remeasurements of net defined benefit liabilities, Tax effect 41,664 (65,733) (18,696)
Share of Gain (loss) of associates and joint ventures, and others, Tax effect (7,225) 3,748 9,097
Exchange differences on translation for foreign operations, Tax effect (8,146) (5,852) (178)
Gain or loss on disposal of treasury stock, Tax effect (101) 14,886 4,080
Total, Tax effect (8,198) 16,517 (41,453)
Gain (loss) on valuation of financial assets at fair value through other comprehensive income, After recognition 121,805 (158,574) 129,780
Gain (loss) on valuation of hedge instruments (loss) liabilities, After recognition (22,613) (31,330) 5,272
Remeasurements of net defined benefit liabilities, After recognition (137,465) 181,429 55,822
Share of Gain (loss) of associates and joint ventures, and others, After recognition 21,490 (11,183) (25,812)
Exchange differences on translation for foreign operations, After recognition 24,230 17,464 505
Gain or loss on disposal of treasury stock, After recognition 301 (44,422) (11,577)
Total other comprehensive income ₩ 7,748 ₩ (46,616) ₩ 153,990