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Benefit Plans - Postemployment Benefit Plans (Details) - Postemployment Benefit Plans - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 2 $ 2 $ 3
Interest cost 0 0 1 1
Amortization of net gains (1) 0 (2) (1)
Net periodic cost/(benefit) $ 0 $ 2 $ 1 $ 3