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Provisions (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Provisions |  |
Provisions, current liabilities | $ 1,826 | $ 1,230
Provisions, non-current liabilities | 8,434 | 8,493
Payroll, related charges and other remunerations |  |
Provisions |  |
Provisions, current liabilities | 877 | 790
Onerous contracts |  |
Provisions |  |
Provisions, current liabilities | 58 | 57
Provisions, non-current liabilities | 838 | 866
Provision related to VNC sale |  |
Provisions |  |
Provisions, current liabilities | 500 |
Environmental obligations |  |
Provisions |  |
Provisions, current liabilities | 102 | 146
Provisions, non-current liabilities | 200 | 243
Asset retirement obligations |  |
Provisions |  |
Provisions, current liabilities | 99 | 158
Provisions, non-current liabilities | 4,121 | 3,802
Provision for litigations |  |
Provisions |  |
Provisions, current liabilities | 87 |
Provisions, non-current liabilities | 1,004 | 1,462
Provisions | 1,091 |
Employee postretirement obligations |  |
Provisions |  |
Provisions, current liabilities | 103 | 79
Provisions, non-current liabilities | $ 2,271 | $ 2,120

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- Definition The amount of current provisions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_l&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of non-current provisions. [Refer: Provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph l -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_l&doctype=Standard -URIDate 2020-01-01 + Details
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