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Benefit Plans - Postemployment Benefit Plans (Details) - Postemployment Benefit Plans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2 $ 1 $ 5 $ 4
Interest cost 1 1 2 3
Amortization of net gains (2) (1) (3) (3)
Net periodic cost/(benefit) $ 1 $ 1 $ 4 $ 4