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Acquisitions and divestitures - Henan Longyu Energy Resources (Details) - Henan Longyu $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |
Percentage of total outstanding common shares disposed | 25.00% |  |
Number of coal mines the entity operates | item | 2 |  |
Proceeds from sale of assets | $ 156 |  |
Impairment loss |  |  | $ 163
Reclassification of gain related to the cumulative translation adjustments on to income statements |  | $ 116 |

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