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Pension benefits - Annual Pension Cost (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jul. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]          
Service cost $ 2 $ 1 $ 1 $ 3  
Interest cost on prior years’ benefit obligation 1 0 0 1 $ 1
Gross pension cost for the year 3 1 1 4  
Expected return on plan assets (1) 0 0 (1)  
Net pension cost for the year 2 1 1 3  
Impact of settlement/curtailment of defined benefit plans 0 0 1  
Total net pension cost $ 2 $ 1 $ 2 $ 3