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Lease - Summary of Details of Finance Lease Assets (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of recognised finance lease as assets by lessee [Line Items] |  |
Finance lease assets | ₩ 190,811 | ₩ 199,884
Gross carrying amount [member] |  |
Disclosure of recognised finance lease as assets by lessee [Line Items] |  |
Finance lease assets | 343,055 | 325,975
Accumulated depreciation and amortisation [member] |  |
Disclosure of recognised finance lease as assets by lessee [Line Items] |  |
Finance lease assets | ₩ (152,244) | ₩ (126,091)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of assets recognised by the entity, which are leased under finance leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2018-01-01 -Paragraph 31 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2018-03-02&anchor=para_31_a&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |