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Fair Value - Summary of Valuation Techniques and Inputs (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets      
Financial assets at fair value through other comprehensive income ₩ 258,516 ₩ 557,342  
Other financial assets      
Financial assets at fair value through profit or loss 809,919 632,324  
Derivative financial assets for hedging 7,684 58,576  
Investment properties 1,368,453 1,387,430 ₩ 1,091,084
Other financial liabilities      
Financial liabilities at fair value through profit or loss 2,682 38  
Derivative financial liabilities for hedging 127,929 20,096  
Level 2 [Member]      
Other financial assets      
Derivative financial assets for hedging ₩ 7,684 ₩ 58,576  
Other financial liabilities      
Valuation techniques DCF Model    
Valuation techniques   DCF Model  
Level 2 [Member] | Financial assets at fair value through profit or loss [member]      
Other financial liabilities      
Valuation techniques   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 ₩ 1,118,619 ₩ 1,256,266  
Level 2, 3 [Member]      
Other financial liabilities      
Derivative financial liabilities for hedging ₩ 127,929 20,096  
Valuation techniques 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 ₩ 763,470 ₩ 632,092  
Other financial liabilities      
Valuation techniques DCF Model, Adjusted net asset model DCF Model, Adjusted net asset model  
Valuation techniques DCF Model, Binomial Option Pricing    
Level 2, 3 [Member] | Financial assets at fair value through other comprehensive income [member]      
Assets      
Financial assets at fair value through other comprehensive income ₩ 252,910 ₩ 550,604  
Other financial liabilities      
Valuation techniques DCF Model, Comparable Company Analysis DCF Model, Comparable Company Analysis  
Level 3 [Member]      
Other financial assets      
Investment properties ₩ 2,645,482 ₩ 2,304,583  
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 ₩ 2,682 ₩ 38