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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 10 $ 11 $ 20 $ 22
Interest cost 17 14 34 27
Expected return on plan assets (54) (48) (107) (96)
Amortization of net losses 12 16 24 33
Amortization of prior service benefit 0 0 0 0
Net benefit (15) (7) (29) (14)
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 2 1 3 3
Interest cost 2 2 4 4
Expected return on plan assets (3) (3) (6) (6)
Amortization of net losses 0 1 0 1
Amortization of prior service benefit (7) (7) (13) (13)
Net benefit $ (6) $ (6) $ (12) $ (11)