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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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)

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