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Fair value measurement of assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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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 |

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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 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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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 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_h&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_a&doctype=Standard -URIDate 2019-03-27 + Details
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