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Pension and Other Postretirement Benefits - Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Pension    
Components of net periodic benefit cost:    
Service cost $ 12 $ 13
Interest cost 13 10
Expected return on plan assets (27) (25)
Amortization of actuarial loss (gain) 7 13
Total net periodic benefit cost 5 11
Other Postretirement Benefits    
Components of net periodic benefit cost:    
Service cost 2 2
Interest cost 3 3
Expected return on plan assets (6) (7)
Amortization of actuarial loss (gain) (1) 0
Total net periodic benefit cost $ (2) $ (2)