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Employee Benefit Plans - Postemployment Plan (Details) - Postemployment Retirement Benefits - 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]        
Net service cost $ 3 $ 7 $ 9 $ 13
Interest cost 0 1 1 1
Amortization of prior service benefit 0 (1) (1) (1)
Amortization of actuarial gain 0 (1) 0 (2)
Net benefit cost $ 3 $ 6 $ 9 $ 11