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Fair value measurement of assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	₩ 399,495	₩ 0
Available-for-sale financial assets		699,833	₩ 1,014,732
Financial assets at fair value through profit or loss	920,935	111,512
At fair value
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	399,495	0
Available-for-sale financial assets	0	661,907
Derivative assets	102,335	32,626
Financial assets at fair value through profit or loss	920,935	111,512
Total	1,422,765	806,045
At fair value | Level 1
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	210,056	0
Available-for-sale financial assets	0	274,453
Derivative assets	0	0
Financial assets at fair value through profit or loss	106,600	0
Total	316,656	274,453
At fair value | Level 2
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	0	0
Available-for-sale financial assets	0	214,156
Derivative assets	100,490	18,466
Financial assets at fair value through profit or loss	809,283	111,512
Total	909,773	344,134
At fair value | Level 3
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	189,439	0
Available-for-sale financial assets	0	173,298
Derivative assets	1,845	14,160
Financial assets at fair value through profit or loss	5,052	0
Total	₩ 196,336	₩ 187,458

X

- Definition

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

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- Definition

The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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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]

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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]

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