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Financial Instruments by Category - Summary of Financial Instruments by Category (Detail)
₩ in Millions
Dec. 31, 2020
KRW (₩)
Dec. 31, 2020
SGD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
KRW (₩)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2017
KRW (₩)
Disclosure of detailed information about financial instruments [line items]            
Trade and other payables ₩ 7,017,639     ₩ 8,679,698    
Borrowings 7,316,298 $ 284,000,000 $ 519,598,989 7,298,867    
Other financial liabilities 263,169     150,079    
Cash and cash equivalents 2,634,624     2,305,894 ₩ 2,703,422 ₩ 1,928,182
Trade and other receivables 6,095,042     7,004,725    
Other financial assets 1,747,187     1,690,046    
Loans and receivables [member]            
Disclosure of detailed information about financial instruments [line items]            
Cash and cash equivalents 2,634,624     2,305,894    
Trade and other receivables 4,976,423     5,748,459    
Other financial assets 671,068     441,804    
Financial assets at fair value through profit or loss [member]            
Disclosure of detailed information about financial instruments [line items]            
Other financial assets 809,919     632,324    
Derivative used for hedge [member]            
Disclosure of detailed information about financial instruments [line items]            
Other financial liabilities 127,929     20,096    
Other financial assets 7,684     58,576    
Financial liabilities designated as at fair value through profit or loss [member]            
Disclosure of detailed information about financial instruments [line items]            
Other financial liabilities 2,682     38    
Financial liabilities at amortized cost [member]            
Disclosure of detailed information about financial instruments [line items]            
Trade and other payables 7,017,639     8,679,698    
Borrowings 7,316,298     7,298,867    
Other financial liabilities 132,558     129,945    
Financial assets at fair value through other comprehensive income [member]            
Disclosure of detailed information about financial instruments [line items]            
Trade and other receivables 1,118,619     1,256,266    
Other financial assets ₩ 258,516     ₩ 557,342