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Benefit Plans - Changes in Accumulated Postemployment Benefit Obligations (Details) - Postemployment Benefit Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at January 1 $ 76 $ 71  
Service cost 6 5 $ 7
Interest cost 4 4 6
Benefits paid (7) (6)  
Assumption changes (1) 0  
Actuarial losses/(gains) (4) 2  
Projected benefit obligation at December 31 $ 74 $ 76 $ 71