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Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 10,731,034 ₩ 10,873,266
Cash and cash equivalents (except for cash on hand) [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 2,625,581 2,226,608
Financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 5,034,621 5,784,228
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 1,118,619 1,256,266
Contract assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 586,438 557,041
Derivatives financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 7,684 58,576
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 680,453 541,657
Other financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 6,570 7,086
Other financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 671,068 ₩ 441,804