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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