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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 11 $ 10
Interest cost 13 19
Expected return on plan assets (48) (48)
Amortization of net losses 17 13
Amortization of prior service benefit 0 0
Net benefit (7) (6)
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 2 1
Interest cost 2 3
Expected return on plan assets (3) (3)
Amortization of net losses 0 0
Amortization of prior service benefit (6) (6)
Net benefit $ (5) $ (5)