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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 10 $ 10 $ 30 $ 32
Interest cost 17 14 51 41
Expected return on plan assets (53) (48) (160) (144)
Amortization of net losses 12 16 36 49
Amortization of prior service benefit 0 0 0 0
Net benefit (14) (8) (43) (22)
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 3 1 7 5
Expected return on plan assets (3) (3) (9) (9)
Amortization of net losses 0 0 0 1
Amortization of prior service benefit (6) (6) (19) (19)
Net benefit $ (5) $ (7) $ (17) $ (18)