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Business combination - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 01, 2020
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Jun. 25, 2020
Business combination            
Purchase consideration net of estimated cash at closing     $ 118      
Remeasurement gain on acquisition   $ 85 85      
2027 Notes            
Business combination            
Long-term Debt, Gross       $ 150 $ 150 $ 150
Vricon            
Business combination            
Remaining ownership interest acquired 50.00%          
Purchase consideration $ 143          
Cash on hand 23          
Purchase consideration net of estimated cash at closing 120          
Cash settlement of equity awards 26          
Call option purchase price 117          
Stock-based vested awards settled in cash $ 26          
Vricon | Other (income) expense            
Business combination            
Remeasurement gain on acquisition   $ 85 $ 85