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Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 10,508,462 ₩ 10,220,555
Cash and cash equivalents (except for cash on hand) [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 2,284,885 1,926,620
Financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 5,425,996 6,793,397
Financial assets at fair value through other comprehensive income [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 1,097,348  
Contract assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 398,797  
Derivatives financial assets for hedging [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 29,843 7,389
Financial assets at fair value through profit or loss [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 714,653 5,813
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 6,909  
Other financial assets at amortized costs [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 484,271  
Available-for-sale [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk   9,899
Held-to-maturity financial assets [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk   151
Financial instruments and others [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk   1,333,317
Financial guarantee contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 65,760 ₩ 143,969