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Trade and Other Receivables - Summary of Aging Analysis of Other Receivables (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]    
Other receivables ₩ 3,450,577 ₩ 3,100,811
Other assets [member]    
Disclosure of financial assets [line items]    
Less Allowance for doubtful accounts (84,372) (141,616)
Gross carrying amount [member] | Neither past due nor impaired [member]    
Disclosure of financial assets [line items]    
Other receivables 3,271,949 2,971,239
Gross carrying amount [member] | Past due and impaired [member]    
Disclosure of financial assets [line items]    
Other receivables 263,000 271,188
Gross carrying amount [member] | Past due and impaired [member] | Up to 6 months [member]    
Disclosure of financial assets [line items]    
Other receivables 169,894 134,231
Gross carrying amount [member] | Past due and impaired [member] | 6 months to 12 months [member]    
Disclosure of financial assets [line items]    
Other receivables 16,052 12,805
Gross carrying amount [member] | Past due and impaired [member] | Over 12 months [member]    
Disclosure of financial assets [line items]    
Other receivables ₩ 77,054 ₩ 124,152