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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 7 $ 10 $ 19 $ 30
Interest cost 27 17 81 51
Expected return on plan assets (53) (53) (157) (160)
Amortization of net losses 1 12 3 36
Amortization of prior service benefit 0 0 0 0
Net benefit (18) (14) (54) (43)
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 3 4
Interest cost 4 3 13 7
Expected return on plan assets (2) (3) (8) (9)
Amortization of net losses (1) 0 (1) 0
Amortization of prior service benefit (6) (6) (19) (19)
Net benefit $ (4) $ (5) $ (12) $ (17)