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Fair Value - Summary of Valuation Techniques and Inputs (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Dec. 31, 2017
Assets        
Financial assets at fair value through other comprehensive income ₩ 557,342 ₩ 326,157    
Other financial assets        
Financial assets at fair value through profit or loss 632,324 777,685    
Derivative financial assets for hedging 58,576 29,843    
Investment properties 1,387,430 1,091,084 ₩ 46,666 ₩ 1,189,531
Other financial liabilities        
Financial liabilities at fair value through profit or loss 38 7,758    
Derivative financial liabilities for hedging 20,096 57,308    
Level 2 [Member]        
Other financial assets        
Derivative financial assets for hedging ₩ 58,576 ₩ 29,843    
Other financial liabilities        
Valuation techniques Hull-White model, DCF Model DCF Model    
Level 2 [Member] | Financial assets at fair value through other comprehensive income [member]        
Other financial liabilities        
Valuation techniques DCF Model DCF Model    
Level 2 [Member] | Financial assets at fair value through other comprehensive income [member] | Trades and other receivables [member]        
Assets        
Financial assets at fair value through other comprehensive income ₩ 1,256,266 ₩ 1,097,348    
Level 2, 3 [Member]        
Other financial liabilities        
Derivative financial liabilities for hedging ₩ 20,096 ₩ 57,308    
Valuation techniques Hull-White model, DCF Model Hull-White model, DCF Model    
Level 2, 3 [Member] | Financial assets at fair value through profit or loss [member]        
Other financial assets        
Financial assets at fair value through profit or loss ₩ 632,092 ₩ 777,564    
Other financial liabilities        
Valuation techniques DCF Model, Adjusted net asset model DCF Model, Adjusted net asset model    
Level 2, 3 [Member] | Financial assets at fair value through other comprehensive income [member]        
Assets        
Financial assets at fair value through other comprehensive income ₩ 550,604 ₩ 317,296    
Other financial liabilities        
Valuation techniques DCF Model DCF Model    
Level 3 [Member]        
Other financial assets        
Investment properties ₩ 2,304,583 ₩ 1,821,061    
Other financial liabilities        
Valuation techniques DCF Model DCF Model    
Level 3 [Member] | Financial assets at fair value through profit or loss [member]        
Other financial liabilities        
Financial liabilities at fair value through profit or loss ₩ 38 ₩ 7,758    
Valuation techniques DCF Model, Comparable Company Analysis DCF Model, Comparable Company Analysis