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Financial Instruments by Category - Summary of Financial Instruments by Category (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about financial instruments [line items]          
Trade and other payables ₩ 8,521,379 ₩ 8,427,457      
Borrowings 6,648,293 6,683,662      
Other financial liabilities 164,396 186,491      
Cash and cash equivalents 2,703,422 1,928,182 ₩ 2,900,311 ₩ 2,900,311 ₩ 2,559,464
Trade and other receivables 6,523,344 6,793,397      
Other financial assets 1,617,956 1,727,623      
Loans and receivables [member]          
Disclosure of detailed information about financial instruments [line items]          
Cash and cash equivalents 2,703,422 1,928,182      
Trade and other receivables 5,425,996 6,793,397      
Other financial assets 484,271 1,333,317      
Financial assets at fair value through profit or loss [member]          
Disclosure of detailed information about financial instruments [line items]          
Other financial assets 777,685 5,813      
Derivative used for hedge [member]          
Disclosure of detailed information about financial instruments [line items]          
Other financial liabilities 57,308 93,770      
Other financial assets 29,843 7,389      
Available-for-sale [member]          
Disclosure of detailed information about financial instruments [line items]          
Other financial assets   380,953      
Held-to-maturity financial assets [member]          
Disclosure of detailed information about financial instruments [line items]          
Other financial assets   151      
Financial liabilities designated as at fair value through profit or loss [member]          
Disclosure of detailed information about financial instruments [line items]          
Other financial liabilities 7,758 5,051      
Financial liabilities at amortized cost [member]          
Disclosure of detailed information about financial instruments [line items]          
Trade and other payables 8,521,379 8,427,457      
Borrowings 6,648,293 6,683,662      
Other financial liabilities 99,330 ₩ 87,670      
Financial assets at fair value through other comprehensive income [member]          
Disclosure of detailed information about financial instruments [line items]          
Trade and other receivables 1,097,348        
Other financial assets ₩ 326,157