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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 6 $ 10 $ 12 $ 20
Interest cost 27 17 54 34
Expected return on plan assets (52) (54) (104) (107)
Amortization of net losses 1 12 2 24
Amortization of prior service benefit 0 0 0 0
Net benefit (18) (15) (36) (29)
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 2 2 3
Interest cost 5 2 9 4
Expected return on plan assets (3) (3) (6) (6)
Amortization of net losses 0 0 0 0
Amortization of prior service benefit (7) (7) (13) (13)
Net benefit $ (4) $ (6) $ (8) $ (12)