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Benefit Plans - Changes in Accumulated Postemployment Benefit Obligations (Details) - Postemployment Benefit Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at January 1 $ 65 $ 66  
Service cost 6 6 $ 6
Interest cost 3 3 5
Benefits paid (12) (10)  
Actuarial losses/(gains) (6) 0  
Projected benefit obligation at December 31 $ 56 $ 65 $ 66