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Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 14,707,856 ₩ 13,027,594
Cash and cash equivalents (except for cash on hand) [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 2,869,285 2,437,629
Financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 8,458,259 7,459,994
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 116,198 129,124
Contract assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 832,520 802,253
Derivatives financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 159,211 190,830
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 880,549 942,274
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 5,913 5,432
Financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 1,385,921 ₩ 1,060,058