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Acquisitions and divestitures - Boston Metal (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 28, 2021 | Jun. 30, 2021 | Jun. 30, 2021
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Purchase amount |  | $ 2,345 | $ 2,345
Boston Electrometallurgical Company |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |
Purchase amount | $ 6 |  |
Proportion of ownership interests held in non-controlling interests | 3.24% |  |

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