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Pensions and Other Postretirement Benefits - Benefit Cost Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 40 $ 43 $ 40
Interest cost 67 55 74
Expected return on plan assets (213) (193) (190)
Amortization of net losses 49 66 51
Amortization of prior service cost 0 0 1
Net cost (benefit) (57) (29) (24)
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 6 6 6
Interest cost 9 7 12
Expected return on plan assets (13) (12) (14)
Amortization of net losses 0 1 0
Amortization of prior service cost (25) (26) (25)
Net cost (benefit) $ (23) $ (24) $ (21)