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Pensions and Other Postretirement Benefits - Benefit Cost Components (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 25 $ 40 $ 43
Interest cost 108 67 55
Expected return on plan assets (208) (213) (193)
Amortization of net losses 4 49 66
Amortization of prior service benefit (1) 0 0
Net cost (benefit) (72) (57) (29)
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 4 6 6
Interest cost 17 9 7
Expected return on plan assets (11) (13) (12)
Amortization of net losses 0 0 1
Amortization of prior service benefit (26) (25) (26)
Net cost (benefit) $ (16) $ (23) $ (24)