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Provisions and other non-current liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |
Defined benefit pension plans | $ 3,538 | $ 3,469 |
Other long-term employee benefits and deferred compensation | 637 | 546 |
Other post-employment benefits | 543 | 612 |
Environmental remediation provisions | 642 | 592 | $ 634
Product liability, government investigations, other legal matters provisions | 181 | 200 | $ 214
Contingent consideration | 984 | 958 |
Other non-current liabilities | 409 | 255 |
Total provisions and other non-current liabilities | $ 6,934 | $ 6,632 |

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