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Provisions (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Provisions |  |  |
Provisions, current liabilities | $ 1,156 | $ 1,826 |
Provisions, non-current liabilities | 8,003 | 8,434 |
Payroll, related charges and other remunerations |  |  |
Provisions |  |  |
Provisions, current liabilities | 692 | 877 |
Onerous contracts |  |  |
Provisions |  |  |
Provisions, current liabilities | 53 | 58 |
Provisions, non-current liabilities | 842 | 838 |
Environmental obligations |  |  |
Provisions |  |  |
Provisions, current liabilities | 95 | 102 |
Provisions, non-current liabilities | 214 | 200 |
Asset retirement obligations (i) |  |  |
Provisions |  |  |
Provisions, current liabilities | 102 | 99 |
Provisions, non-current liabilities | 3,974 | 4,121 |
Provision related to VNC sale (note 12) |  |  |
Provisions |  |  |
Provisions, current liabilities |  | 500 |
Provisions for litigation |  |  |
Provisions |  |  |
Provisions, current liabilities | 102 | 87 | $ 84
Provisions, non-current liabilities | 1,074 | 1,004 | $ 1,060
Employee postretirement obligations (note 24) |  |  |
Provisions |  |  |
Provisions, current liabilities | 112 | 103 |
Provisions, non-current liabilities | $ 1,899 | $ 2,271 |

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