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Benefit Plans - Postemployment Benefit Plans (Details) - Postemployment Benefit Plans - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2 $ 2 $ 3 $ 3
Interest cost 0 1 1 2
Amortization of net gains 0 (1) (1) (2)
Net periodic benefit cost (credit) $ 2 $ 2 $ 3 $ 3