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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Net debt and Short-term investments (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Loans and borrowings |  |  |  |  |  |
Leases | $ 1,708 |  | $ 1,667 |  |  |
Total of loans, borrowings and leases | 13,862 |  | 15,027 |  |  |
Cash and cash equivalents | 13,649 | $ 12,883 | 13,487 | $ 12,113 | $ 11,788 | $ 7,350
Short-term investments | 951 |  | 771 |  |  |
Net debt (cash) | (738) |  | 769 |  |  |
Debt contracts in the international markets |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |
Total of loans, borrowings and leases | 11,194 |  | 11,890 |  |  |
Debt contracts in Brazil |  |  |  |  |  |
Loans and borrowings |  |  |  |  |  |
Total of loans, borrowings and leases | $ 960 |  | $ 1,470 |  |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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