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Financial instruments - Additional information (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |
Payments |  | $ 20 |
Contingent consideration | $ 455 |  |
Unsettled derivative positions - assets (liabilities), net | (1) |  | $ (4)
Gains on change in fair value of derivatives | 3 |  | 3
Losses on change in fair value of derivatives | $ (4) |  | $ (7)
Minimum |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Probability of success, contingent consideration | 550,000 |  |
Maximum |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Probability of success, contingent consideration | 900,000 |  |
Level 3 | Contingent consideration liabilities |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Payments | $ 15 | 20 |
Adjustments for changes in assumptions | $ 0 | $ 40 |

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