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Provisions - Asset retirement obligations - Changes in long-term interest rates (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Brazil |  |
Provisions. |  |
Long-term interest rates (per annum) (as a percent) | 3.54% | 3.36%
Canada |  |
Provisions. |  |
Long-term interest rates (per annum) (as a percent) | 0.00% | 0.40%
Mozambique |  |
Provisions. |  |
Long-term interest rates (per annum) (as a percent) | 5.67% | 5.20%
Minimum | Other regions |  |
Provisions. |  |
Long-term interest rates (per annum) (as a percent) | 0.00% | 0.60%
Maximum | Other regions |  |
Provisions. |  |
Long-term interest rates (per annum) (as a percent) | 4.73% | 4.78%
Asset retirement obligations | Base metals |  |
Provisions. |  |
Letters of credit and surety bonds issued in relation to asset retirement obligation | $ 651 |

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