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Income taxes - Income tax rate (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income taxes      
Statutory U.S. Federal income tax rate 21.00% 21.00% 21.00%
Expected income tax (benefit) expense at statutory rate $ (14) $ 16 $ (194)
Non-deductible expenses 8 15 6
Tax on international operations   (1) (45)
Change in valuation allowance 49 (108) 96
Base Erosion and Anti-Abuse Tax (5) 5  
Outside basis difference in assets held for sale (39) 78  
Tax credits (3) (1) (9)
Non-deductible goodwill impairment     98
Remeasurement of previously held equity interest (18)    
Other   1  
Income tax (benefit) expense $ (22) $ 5 $ (48)
Effective income tax rate 32.00% 6.00% 5.00%