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Fair Value - Summary of Valuation Techniques and Inputs (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets      
Financial assets at fair value through other comprehensive income ₩ 326,157    
Other financial assets      
Available-for-sale financial assets   ₩ 380,953  
Financial assets at fair value through profit or loss 777,685 5,913  
Financial assets at fair value through other comprehensive income 326,157    
Derivative financial assets for hedging 29,843 7,389  
Investment properties 1,091,084 1,189,531 ₩ 1,148,044
Other financial liabilities      
Financial liabilities at fair value through profit or loss 7,758 5,051  
Derivative financial liabilities for hedging 57,308 93,771  
Level 2 [Member]      
Other financial assets      
Derivative financial assets for hedging ₩ 29,843 ₩ 7,389  
Other financial liabilities      
Valuation techniques DCF Model DCF Model  
Level 2 [Member] | Financial assets at fair value through other comprehensive income [member]      
Other financial liabilities      
Valuation techniques 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 ₩ 1,097,348    
Other financial assets      
Financial assets at fair value through other comprehensive income 1,097,348    
Level 2, 3 [Member]      
Other financial liabilities      
Derivative financial liabilities for hedging ₩ 57,308 ₩ 93,770  
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      
Available-for-sale financial assets   ₩ 312,543  
Financial assets at fair value through profit or loss ₩ 777,564    
Other financial liabilities      
Valuation techniques DCF Model, Adjusted net asset model DCF 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 ₩ 317,296    
Other financial assets      
Financial assets at fair value through other comprehensive income ₩ 317,296    
Other financial liabilities      
Valuation techniques DCF Model    
Level 3 [Member]      
Other financial assets      
Investment properties ₩ 1,821,061 ₩ 1,755,600  
Other financial liabilities      
Valuation techniques   DCF Model  
Valuation techniques DCF Model DCF Model, Comparable Company Analysis  
Level 3 [Member] | Financial assets at fair value through profit or loss [member]      
Other financial assets      
Financial assets at fair value through profit or loss   ₩ 5,813  
Other financial liabilities      
Other derivative financial liabilities   ₩ 5,051  
Financial liabilities at fair value through profit or loss ₩ 7,758    
Valuation techniques   DCF Model  
Valuation techniques DCF Model, Comparable Company Analysis