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Employee Benefit Plans - Postemployment Plan (Details) - Postemployment Retirement Benefits - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Net service cost $ 13 $ 6
Interest cost 1 1
Amortization of prior service benefit (1) (1)
Amortization of actuarial gain 0 0
Net benefit cost $ 13 $ 6