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Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 10,892,688 ₩ 10,508,462
Cash and cash equivalents (except for cash on hand) [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 2,226,608 2,284,885
Financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 5,784,228 5,425,996
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 1,256,266 1,097,348
Contract assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 557,041 398,797
Derivatives financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 58,576 29,843
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 541,657 714,653
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 7,086 6,909
Other financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 441,804 484,271
Financial guarantee contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 19,422 ₩ 65,760