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Financial Instruments - Changes in Fair Value of Financial Assets and Financial Liabilities Classified as Level 3 (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of fair value measurement of assets [line items]    
Beginning ₩ 103,443,735  
Ending 105,287,678 ₩ 103,443,735
Fair value [member] | Level 3 [member]    
Disclosure of fair value measurement of assets [line items]    
Beginning 1,234,777 875,091
Acquisition 122,766 398,296
Gain on valuation of financial assets 6,426 48,336
Other comprehensive income(loss) 1,941 (13,066)
Disposal and others (106,619) (73,880)
Ending ₩ 1,259,291 ₩ 1,234,777