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Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 13,027,594 ₩ 11,578,687
Cash and cash equivalents (except for cash on hand) [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 2,437,629 2,989,713
Financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 7,459,994 5,687,103
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 129,124 491,713
Contract assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 802,253 745,085
Derivatives financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 190,830 99,453
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 942,274 862,481
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 5,432 94,750
Financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 1,060,058 ₩ 608,389