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Provisions and other non-current liabilities (Details 3) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Environmental provision, fiscal year maturity [abstract] |  |  |  |
Due within two years | $ 181 |  |  |
Due later than two years, but within five years | 210 |  |  |
Due later than five years, but within ten years | 338 |  |  |
Due after ten years | 80 |  |  |
Total environmental remediation liability provisions | $ 809 | $ 714 | $ 692 | $ 761

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- References No definition available. + Details
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Balance Type: | credit
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