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Fair value measurement of assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of fair value measurement of assets [Line Items] |  |  |
Financial assets at fair value through other comprehensive income | ₩ 358,559 | ₩ 379,170 | ₩ 399,494
Derivative assets | 172,910 | 321,116 |
Financial assets at fair value through profit or loss | 1,881,382 | 747,261 |
At fair value |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Financial assets at fair value through other comprehensive income | 358,559 | 379,170 |
Derivative assets | 166,413 | 311,033 |
Financial assets at fair value through profit or loss | 1,881,382 | 747,261 |
Total | 2,406,354 | 1,437,464 |
At fair value | Level 1 |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Financial assets at fair value through other comprehensive income | 194,670 | 201,202 |
Derivative assets | 0 | 0 |
Financial assets at fair value through profit or loss | 0 | 0 |
Total | 194,670 | 201,202 |
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 | 166,413 | 308,399 |
Financial assets at fair value through profit or loss | 1,875,690 | 742,105 |
Total | 2,042,103 | 1,050,504 |
At fair value | Level 3 |  |  |
Disclosure of fair value measurement of assets [Line Items] |  |  |
Financial assets at fair value through other comprehensive income | 163,889 | 177,968 |
Derivative assets | 0 | 2,634 |
Financial assets at fair value through profit or loss | 5,692 | 5,156 |
Total | ₩ 169,581 | ₩ 185,758 |

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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 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + 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 2020-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_h&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_a&doctype=Standard -URIDate 2020-01-01 + Details
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