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Fair value measurement of assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [Line Items]
Available-for-sale financial assets	₩ 699,833	₩ 1,014,732
Financial assets at fair value through profit or loss	111,512
At fair value [Member]
Disclosure of fair value measurement of assets [Line Items]
Available-for-sale financial assets	661,907	974,647
Derivative assets	32,626	781,374
Financial assets at fair value through profit or loss	111,512
Total	806,045	1,756,021
At fair value [Member] | Level 1 [Member]
Disclosure of fair value measurement of assets [Line Items]
Available-for-sale financial assets	274,453	268,171
Total	274,453	268,171
At fair value [Member] | Level 2 [Member]
Disclosure of fair value measurement of assets [Line Items]
Available-for-sale financial assets	214,156	437,015
Derivative assets	18,466	770,851
Financial assets at fair value through profit or loss	111,512
Total	344,134	1,207,866
At fair value [Member] | Level 3 [Member]
Disclosure of fair value measurement of assets [Line Items]
Available-for-sale financial assets	173,298	269,461
Derivative assets	14,160	10,523
Total	₩ 187,458	₩ 279,984

X

- 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
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- Definition

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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
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-IssueDate 2017-01-01
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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

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- References

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