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Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of detailed information about financial instruments [Line Items]        
Trade and other payables ₩ 8,425,503 ₩ 8,328,082    
Borrowings 6,683,662 8,120,791    
Other financial liabilities 186,490 108,664    
Cash and cash equivalents 1,928,182 2,900,311 ₩ 2,559,464 ₩ 1,888,663
Trade and other receivables 6,643,115 6,036,363    
Other financial assets 1,727,623 1,385,281    
Loans and receivables [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Cash and cash equivalents 1,928,182 2,900,311    
Trade and other receivables 6,643,115 6,036,363    
Other financial assets 1,333,317 716,769    
Financial assets at fair value through profit or loss [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Other financial assets 5,813 6,277    
Derivatives contracts [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Other financial liabilities 93,770 14,928    
Other financial assets 7,389 227,318    
Available-for-sale [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Other financial assets 380,953 404,774    
Held-to-maturity financial assets [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Other financial assets 151 30,143    
Financial liabilities designated as at fair value through profit or loss [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Other financial liabilities 5,051 1,973    
Financial liabilities at amortized cost [member]        
Disclosure of detailed information about financial instruments [Line Items]        
Trade and other payables 8,425,503 8,328,082    
Borrowings 6,683,662 8,120,791    
Other financial liabilities ₩ 87,669 ₩ 91,763