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Benefit Plans - Postretirement funded status (Details) - Postemployment Retirement Benefits - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Benefit obligation      
Balance at the beginning of the period $ 64 $ 70  
Service cost 1 1 $ 1
Interest cost 3 3 3
Plan curtailments   (1)  
Actuarial loss (gain) 6 (2)  
Benefits paid (5) (4)  
Foreign currency translation   (3)  
Balance at the end of the period 69 64 $ 70
Funded status $ (69) $ (64)