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Changes in liabilities incurred from financing activities (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [Line Items] |  |
Beginning balance | ₩ 72,946,674 | ₩ 61,318,433
Cash flows | 1,924,810 | 5,768,637
Increase | 275,686 | 218,800
Changes in accounting policies | 0 | 4,943,584
Effect of exchange rate fluctuations and others | (801,493) | 694,320
Increase from the business combination | 0 | 2,900
Ending balance | 74,345,677 | 72,946,674
Borrowings and debt securities |  |
Disclosure of reconciliation of liabilities arising from financing activities [Line Items] |  |
Beginning balance | 67,876,541 | 61,034,627
Cash flows | 2,538,787 | 6,342,074
Increase | 0 | 0
Changes in accounting policies | 0 | 0
Effect of exchange rate fluctuations and others | (690,747) | 496,940
Effect of exchange rate fluctuations | (640,304) | 494,414
Others | (50,443) | 2,526
Increase from the business combination | 0 | 2,900
Ending balance | 69,724,581 | 67,876,541
Lease liabilities |  |
Disclosure of reconciliation of liabilities arising from financing activities [Line Items] |  |
Beginning balance | 5,070,133 | 283,806
Cash flows | (613,977) | (573,437)
Increase | 275,686 | 218,800
Changes in accounting policies | 0 | 4,943,584
Effect of exchange rate fluctuations and others | (110,746) | 197,380
Increase from the business combination | 0 | 0
Ending balance | ₩ 4,621,096 | ₩ 5,070,133

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from financing cash flows. [Refer: Cash flows from (used in) financing activities; Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from obtaining or losing control of subsidiaries or other businesses. [Refer: Liabilities arising from financing activities; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44B -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase in liabilities arising from financing activities resulting from new leases. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_A_TI -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44B&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_44D&doctype=Standard -URIDate 2020-01-01 + Details
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