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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 10 $ 11
Interest cost 17 13
Expected return on plan assets (53) (48)
Amortization of net losses 12 17
Amortization of prior service benefit 0 0
Net benefit (14) (7)
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 2
Interest cost 2 2
Expected return on plan assets (3) (3)
Amortization of net losses 0 0
Amortization of prior service benefit (6) (6)
Net benefit $ (6) $ (5)