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Contingencies and commitments (U.S. Repatriation Tax Commitments) (Details) $ in Millions | Dec. 31, 2018 USD ($) installment
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Commitments and Contingencies Disclosure [Abstract] |
U.S. repatriation tax commitments, number of annual installments | installment | 8
U.S. repatriation tax commitments, 2019 | $ 586
U.S. repatriation tax commitments, 2020 | 586
U.S. repatriation tax commitments, 2021 | 586
U.S. repatriation tax commitments, 2022 | 586
U.S. repatriation tax commitments, 2023 | 1,099
U.S. repatriation tax commitments, Thereafter | 3,296
Total remaining U.S. repatriation tax commitments | $ 6,739

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