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Fair Value - Summary of Fair Value Hierarchy Classifications of Financial Assets and Financial Liabilities That are Measured at Fair Value (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss | ₩ 777,685 | ₩ 5,913 |
Derivative financial assets for hedging | 29,843 | 7,389 |
Available-for-sale financial assets |  | 380,953 |
Investment properties | 1,091,084 | 1,189,531 | ₩ 1,148,044
Financial assets, at fair value |  | 2,088,204 |
Financial liabilities at fair value through profit or loss | 7,758 | 5,051 |
Derivative financial liabilities for hedging | 57,308 | 93,771 |
Financial liabilities, at fair value |  | 98,821 |
Recurring fair value measurement [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss |  | 5,813 |
Derivative financial assets for hedging |  | 7,389 |
Available-for-sale financial assets |  | 319,402 |
Financial liabilities at fair value through profit or loss |  | 5,051 |
Derivative financial liabilities for hedging |  | 93,770 |
Not measured at fair value in statement of financial position but for which fair value is disclosed [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investment properties |  | 1,755,600 |
Level 1 [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets, at fair value |  | 6,859 |
Level 1 [Member] | Recurring fair value measurement [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Available-for-sale financial assets |  | 6,859 |
Level 2 [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets for hedging | 29,843 | 7,389 |
Financial assets, at fair value |  | 12,855 |
Financial liabilities, at fair value |  | 76,045 |
Level 2 [Member] | Recurring fair value measurement [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative financial assets for hedging |  | 7,389 |
Available-for-sale financial assets |  | 5,466 |
Derivative financial liabilities for hedging |  | 76,045 |
Level 3 [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investment properties | ₩ 1,821,061 | 1,755,600 |
Financial assets, at fair value |  | 2,068,490 |
Financial liabilities, at fair value |  | 22,776 |
Level 3 [Member] | Recurring fair value measurement [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Financial assets at fair value through profit or loss |  | 5,813 |
Available-for-sale financial assets |  | 307,077 |
Financial liabilities at fair value through profit or loss |  | 5,051 |
Derivative financial liabilities for hedging |  | 17,725 |
Level 3 [Member] | Not measured at fair value in statement of financial position but for which fair value is disclosed [Member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Investment properties |  | ₩ 1,755,600 |

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of non-derivative financial assets that are designated as available for sale or are not classified as (a) loans and receivables; (b) held-to-maturity investments; or (c) financial assets at fair value through profit or loss. [Refer: Derivative financial assets; Financial assets at fair value through profit or loss; Held-to-maturity investments] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_8_d&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial liabilities that meet either of the following conditions: (a) they meet the definition of held for trading; or (b) upon initial recognition they are designated by the entity as at fair value through profit or loss. An entity may use this designation only when permitted by paragraph 4.3.5 of IFRS 9 (embedded derivatives) or when doing so results in more relevant information, because either: (a) it eliminates or significantly reduces a measurement or recognition inconsistency (sometimes referred to as ‘an accounting mismatch’) that would otherwise arise from measuring assets or liabilities or recognising the gains and losses on them on different bases; or (b) a group of financial liabilities or financial assets and financial liabilities is managed and its performance is evaluated on a fair value basis, in accordance with a documented risk management or investment strategy, and information about the group is provided internally on that basis to the entity’s key management personnel (as defined in IAS 24). [Refer: At fair value [member]; Key management personnel of entity or parent [member]; Derivatives [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Expiry date 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee under a finance lease) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. Effective 2019-01-01: The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 76 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_76&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=40&date=2018-03-01&anchor=para_79_d&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_b&doctype=Standard -URIDate 2018-03-16 + Details
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