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Trade and Other Receivables - Summary of Aging Analysis of Trade Receivables (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]    
Trade receivables ₩ 3,192,538 ₩ 2,935,552
Gross carrying amount [member] | Neither past due nor impaired [member]    
Disclosure of financial assets [line items]    
Trade receivables 2,661,406 2,377,637
Gross carrying amount [member] | Past due and impaired [member]    
Disclosure of financial assets [line items]    
Trade receivables 970,559 1,028,786
Gross carrying amount [member] | Past due and impaired [member] | Up to 6 months [member]    
Disclosure of financial assets [line items]    
Trade receivables 701,032 685,288
Gross carrying amount [member] | Past due and impaired [member] | 6 months to 12 months [member]    
Disclosure of financial assets [line items]    
Trade receivables 70,190 87,547
Gross carrying amount [member] | Past due and impaired [member] | Over 12 months [member]    
Disclosure of financial assets [line items]    
Trade receivables 199,337 255,951
Allowance for doubtful accounts [member]    
Disclosure of financial assets [line items]    
Trade receivables ₩ (439,427) ₩ (470,871)