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Benefit Plans - Postemployment Benefit Plans (Details) - Postemployment Benefit Plans - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 2 $ 3 $ 5
Interest cost 1 1 2 2
Amortization of net gains (1) (2) (3) (3)
Net periodic pension cost/(benefit) $ 1 $ 1 $ 2 $ 4