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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]    
Trade receivables ₩ 2,839,844 ₩ 2,685,652
Other receivables 2,974,439 2,641,700
Trade and other receivables, net 5,814,283 5,327,352
Trade receivables 352,694 249,900
Other receivables 476,138 459,111
Trade and other receivables, net 828,832 709,011
Gross carrying amount [member]    
Disclosure of financial assets [line items]    
Trade receivables 3,286,169 3,161,234
Other receivables 3,041,028 2,763,942
Trade and other receivables, net 6,327,197 5,925,176
Trade receivables 366,107 263,367
Other receivables 522,459 507,251
Trade and other receivables, net 888,566 770,618
Allowance for doubtful accounts [member]    
Disclosure of financial assets [line items]    
Trade receivables (438,817) (470,239)
Other receivables (66,402) (121,972)
Trade and other receivables, net (505,219) (592,211)
Trade receivables (610) (632)
Other receivables (17,970) (19,644)
Trade and other receivables, net (18,580) (20,276)
Present value discount [member]    
Disclosure of financial assets [line items]    
Trade receivables (7,508) (5,343)
Other receivables (187) (270)
Trade and other receivables, net (7,695) (5,613)
Trade receivables (12,803) (12,835)
Other receivables (28,351) (28,496)
Trade and other receivables, net ₩ (41,154) ₩ (41,331)