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Maturity analysis for derivative financial assets and liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | ₩ (366,732) | ₩ (178,556)
Derivative assets | 172,910 | 321,116
Net settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | 0 | (3,017)
Derivative assets | 0 | 0
Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (158,688) | (58,725)
Derivative assets | 117,261 | 172,653
Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (208,044) | (116,814)
Derivative assets | 55,649 | 145,829
Gross settlement | Not Designated as Hedging Instrument Others |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative assets | 0 | 2,634
Less than 1 year |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (50,635) | (77,874)
Derivative assets | 29,523 | 27,618
Less than 1 year | Net settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | 0 | (3,017)
Derivative assets | 0 | 0
Less than 1 year | Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (12,777) | (15,011)
Derivative assets | 18,332 | 21
Less than 1 year | Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (37,858) | (59,846)
Derivative assets | 11,191 | 27,597
1~2 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (62,355) | (29,761)
Derivative assets | 1,529 | 91,153
1~2 Years | Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (22,827) | (8,295)
Derivative assets | 1,529 | 43,931
1~2 Years | Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (39,528) | (21,466)
Derivative assets | 0 | 47,222
2~5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (194,154) | (41,568)
Derivative assets | 86,443 | 143,396
2~5 Years | Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (118,704) | (39,654)
Derivative assets | 45,237 | 72,386
2~5 Years | Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (75,450) | (1,914)
Derivative assets | 41,206 | 71,010
More than 5 years |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (59,588) | (29,353)
Derivative assets | 55,415 | 58,949
More than 5 years | Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (4,380) | 4,235
Derivative assets | 52,163 | 56,315
More than 5 years | Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative financial liabilities, undiscounted cash flows | (55,208) | (33,588)
Derivative assets | 3,252 | 0
More than 5 years | Gross settlement | Not Designated as Hedging Instrument Others |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Derivative assets | ₩ 0 | ₩ 2,634

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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 The amount of contractual undiscounted cash flows in relation to derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 39 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_39_b&doctype=Standard -URIDate 2020-01-01 + Details
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