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Financial Instruments - Finance Income and Costs by Category of Financial Instruments (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]      
Interest income (expense) ₩ (558,155) ₩ (474,729) ₩ (499,143)
Gain and loss on valuation 21,328 1,149,625 338,996
Gain and loss on foreign currency 742 (741,225) (348,002)
Gain and loss on disposal (159,036) 167,107 118,716
Others 6,976 30,082 17,183
Total (688,145) 130,860 (372,250)
Other comprehensive income (loss) 319,626 (150,553) 256,433
Financial liabilities at fair value through profit or loss      
Disclosure of detailed information about financial instruments [line items]      
Gain and loss on valuation (1,310) 239,120 (305,562)
Gain and loss on foreign currency (4,145) (57,625) (92,835)
Gain and loss on disposal   (6,257)  
Total (5,455) 175,238 (398,397)
Derivative liabilities [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain and loss on valuation 12,049 (31,018) (44,323)
Gain and loss on disposal (358,953) (279,594) (276,600)
Total (346,904) (310,612) (320,923)
Other comprehensive income (loss) 8 (110) (1,292)
Financial liabilities measured at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income (expense) (1,091,462) (1,051,511) (1,001,290)
Gain and loss on foreign currency 38,876 (1,781,845) (466,244)
Gain and loss on disposal   (806) 11
Others (34,187) (36,252) (26,616)
Total (1,086,773) (2,870,414) (1,494,139)
Financial assets at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain and loss on valuation (57,207) 120,544 520,884
Gain and loss on disposal 51,353 136,699 190,531
Others 9,267 887 560
Total 3,413 258,130 711,975
Derivative assets [member]      
Disclosure of detailed information about financial instruments [line items]      
Gain and loss on valuation 67,796 820,979 167,997
Gain and loss on disposal 221,995 399,680 289,423
Total 289,791 1,220,659 457,420
Financial assets at fair value through other comprehensive income [member]      
Disclosure of detailed information about financial instruments [line items]      
Others 28,789 76,060 49,586
Total 28,789 76,060 49,586
Other comprehensive income (loss) 319,618 (150,443) 257,725
Financial assets at financial assets measured at amortized cost [member]      
Disclosure of detailed information about financial instruments [line items]      
Interest income (expense) 533,307 576,782 502,147
Gain and loss on foreign currency (33,989) 1,098,245 211,077
Gain and loss on disposal (73,431) (82,615) (84,649)
Others 3,107 (10,613) (6,347)
Total ₩ 428,994 ₩ 1,581,799 ₩ 622,228