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Financial instruments - Additional information (Details) - USD ($)
 6 Months Ended
May 27, 2020
Apr. 02, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]          
Contingent liabilities recognised in business combination     $ 490,000,000    
Derivative liabilities, net     1,000,000   $ (15,000,000)
Gains on change in fair value of derivatives     2,000,000   1,000,000
Losses on change in fair value of derivatives     (1,000,000)   $ (16,000,000)
Proceeds from borrowings   $ 3,200,000,000      
Series 2030 notes          
Disclosure of detailed information about borrowings [line items]          
Notional amount $ 750,000,000        
Proceeds from borrowings $ 750,000,000        
Borrowings, interest rate 2.60%        
Revolving facility          
Disclosure of detailed information about borrowings [line items]          
Notional amount     1,000,000,000.0    
Contingent consideration liabilities          
Disclosure of detailed information about borrowings [line items]          
Purchases, fair value measurement, liabilities       $ 135,000,000  
Level 3 | Contingent consideration liabilities          
Disclosure of detailed information about borrowings [line items]          
Adjustments for changes in assumptions     40,000,000 13,000,000  
Payments     20,000,000 0  
Purchases, fair value measurement, liabilities     $ 0 $ 135,000,000