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Maturity analysis for non-derivative financial liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Borrowings and debt securities |  | ₩ 82,326,295 | ₩ 80,399,789
Finance lease liabilities |  | 5,209,537 | 5,757,009
Trade and other payables |  | 8,115,837 | 8,545,029
Financial guarantee contracts | [1] | 3,224,696 | 3,338,566
Non-derivative financial liabilities, undiscounted cash flows |  | 98,876,365 | 98,040,393
Less than 1 year |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Borrowings and debt securities |  | 12,413,346 | 10,660,737
Finance lease liabilities |  | 614,442 | 686,445
Trade and other payables |  | 5,679,856 | 6,014,054
Financial guarantee contracts | [1] | 926,244 | 937,091
Non-derivative financial liabilities, undiscounted cash flows |  | 19,633,888 | 18,298,327
1~2 Years |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Borrowings and debt securities |  | 10,919,041 | 10,997,510
Finance lease liabilities |  | 569,161 | 617,449
Trade and other payables |  | 373,907 | 382,809
Financial guarantee contracts | [1] | 348,860 | 302,186
Non-derivative financial liabilities, undiscounted cash flows |  | 12,210,969 | 12,299,954
2~5 Years |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Borrowings and debt securities |  | 24,778,020 | 27,881,873
Finance lease liabilities |  | 1,564,377 | 1,717,434
Trade and other payables |  | 894,903 | 971,469
Financial guarantee contracts | [1] | 26,230 | 32,314
Non-derivative financial liabilities, undiscounted cash flows |  | 27,263,530 | 30,603,090
More than 5 years |  |  |
Disclosure of maturity analysis for non-derivative financial liabilities [Line Items] |  |  |
Borrowings and debt securities |  | 34,215,888 | 30,859,669
Finance lease liabilities |  | 2,461,557 | 2,735,681
Trade and other payables |  | 1,167,171 | 1,176,697
Financial guarantee contracts | [1] | 1,923,362 | 2,066,975
Non-derivative financial liabilities, undiscounted cash flows |  | ₩ 39,767,978 | ₩ 36,839,022
[1] | This represents the total guarantee amounts associated with the financial guarantee contracts. Financial guarantee liabilities which are recognized as of December 31, 2019 and 2020 are KRW81,357 million and KRW66,354 million, respectively.

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- Definition The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 58 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_58&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph B11D -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
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- Definition The amount of contractual undiscounted cash flows in relation to non-derivative financial liabilities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_39_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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