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Changes in liabilities arising from financing activities (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of reconciliation of liabilities arising from financing activities [Line Items] |  |
Beginning balance | ₩ 61,318,433 | ₩ 55,165,652
Cash flows | 5,768,637 | 5,837,882
Disclosure - Changes in lease liabilities [Abstract] |  |
Interest expense on lease liabilities | (85,950) |
Increase | 218,800 | 0
Changes in accounting policies | 4,943,584 | 0
Effect of exchange rate fluctuations and others | 694,320 | 314,899
Increase from the business combination | 2,900 | 0
Ending balance | 72,946,673 | 61,318,433
Borrowings and debt securities |  |
Disclosure of reconciliation of liabilities arising from financing activities [Line Items] |  |
Beginning balance | 61,034,627 | 54,747,392
Cash flows | 6,342,074 | 5,972,336
Disclosure - Changes in lease liabilities [Abstract] |  |
Increase | 0 | 0
Changes in accounting policies | 0 | 0
Effect of exchange rate fluctuations and others | 496,940 | 314,899
Increase from the business combination | 2,900 | 0
Ending balance | 67,876,540 | 61,034,627
Lease liabilities |  |
Disclosure of reconciliation of liabilities arising from financing activities [Line Items] |  |
Beginning balance | 283,806 | 418,260
Cash flows | (573,437) | (134,454)
Disclosure - Changes in lease liabilities [Abstract] |  |
Interest expense on lease liabilities | (85,950) |
Decrease | 659,387 |
Increase | 218,800 | 0
Changes in accounting policies | 4,943,584 | 0
Effect of exchange rate fluctuations and others | 197,380 | 0
Increase from the business combination | 0 | 0
Ending balance | ₩ 5,070,133 | ₩ 283,806

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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 2019-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_c&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 44B -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_a&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 44B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_b&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -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-2019-en-r&doctype=Illustrative%20Examples&dita_xref=IAS07_IE_A_TI -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44D&doctype=Standard -URIDate 2019-03-27 + Details
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