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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 6 $ 10
Interest cost 27 17
Expected return on plan assets (52) (53)
Amortization of net losses 1 12
Amortization of prior service benefit 0 0
Net benefit (18) (14)
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 4 2
Expected return on plan assets (3) (3)
Amortization of net losses 0 0
Amortization of prior service benefit (6) (6)
Net benefit $ (4) $ (6)