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Other Financial Assets and Liabilities - Summary of Derivative Financial Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about financial instruments [Line Items] |  |
Assets, Total | ₩ 7,389 | ₩ 227,318
Less: Assets, non-current | (4,675) | (97,220)
Assets, Current | 2,714 | 130,098
Liabilities, Total | 93,770 | 14,928
Less: Liabilities, non-current | (56,547) | (14,695)
Liabilities, Current | 37,223 | 233
Interest rate swap [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Liabilities, Total | 2,633 | 3,278
Currency swap [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Assets, Total | 7,389 | 214,648
Liabilities, Total | 81,300 | 11,650
Currency forwards [member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Assets, Total |  | ₩ 12,670
Liabilities, Total | ₩ 9,837 |

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- Definition The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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