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Fair value measurement of assets (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	₩ 379,170	₩ 399,495	₩ 0
Financial assets at fair value through profit or loss	747,261	920,935
At fair value
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	379,170	399,495
Derivative assets	311,033	102,335
Financial assets at fair value through profit or loss	747,261	920,935
Total	1,437,464	1,422,765
At fair value | Level 1
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	201,202	210,056
Derivative assets	0	0
Financial assets at fair value through profit or loss	0	106,600
Total	201,202	316,656
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
Derivative assets	308,399	100,490
Financial assets at fair value through profit or loss	742,105	809,283
Total	1,050,504	909,773
At fair value | Level 3
Disclosure of fair value measurement of assets [Line Items]
Financial assets at fair value through other comprehensive income	177,968	189,439
Derivative assets	2,634	1,845
Financial assets at fair value through profit or loss	5,156	5,052
Total	₩ 185,758	₩ 196,336

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

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
-Number 7
-IssueDate 2019-01-01
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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

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