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Pensions and Other Postretirement Benefits - Benefit Cost Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 43 $ 40 $ 35
Interest cost 55 74 93
Expected return on plan assets (193) (190) (179)
Amortization of net losses 66 51 43
Amortization of prior service cost 0 1 1
Net cost (benefit) (29) (24) (7)
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 6 6 6
Interest cost 7 12 17
Expected return on plan assets (12) (14) (14)
Amortization of net losses 1 0 0
Amortization of prior service cost (26) (25) (24)
Net cost (benefit) $ (24) $ (21) $ (15)