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Changes in lease liabilities (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure - Changes in lease liabilities [Abstract] |  |  |
Beginning balance |  | ₩ 5,070,133 | ₩ 283,806
Changes in accounting policies |  | 0 | 4,943,584
Increase |  | 280,114 | 218,800
Decrease |  | (725,759) | (659,387)
Interest expenses on lease liabilities |  | 111,782 | 85,950
Effect of exchange rate fluctuations and others | [1] | (115,174) | 197,380
Ending balance |  | ₩ 4,621,096 | ₩ 5,070,133
[1] | Including translation effect of foreign currency lease liabilities and others.

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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