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Contingencies and commitments (U.S. Repatriation Tax Commitments) (Details) $ in Millions | Dec. 31, 2021 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, 2022 | $ 587
U.S. repatriation tax commitments, 2023 | 1,100
U.S. repatriation tax commitments, 2024 | 1,467
U.S. repatriation tax commitments, 2025 | 1,834
Total remaining U.S. repatriation tax commitments | $ 4,988

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