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Maximum exposure to credit risk (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Cash and Cash Equivalents |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk |  | ₩ 2,029,584 | ₩ 1,810,129
Financial assets at fair value through profit or loss |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk | [1] | 1,808,404 | 747,261
Not Designated as Hedging Instrument |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk |  | 110,764 | 165,204
Financial assets at amortized cost |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk |  | 14,422 | 13,609
Loans and receivables |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk |  | 790,162 | 738,707
Long-term/short-term financial instruments |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk |  | 2,062,103 | 1,960,227
Designated as Hedging Instrument |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk |  | 55,649 | 145,829
Trade and other receivables |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk |  | 9,780,039 | 9,703,749
Financial guarantee contracts |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Maximum exposure to credit risk | [2] | ₩ 3,224,696 | ₩ 3,338,566
[1] | Equity investments held by the Company are excluded.
[2] | Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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