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Pension and Other Postretirement Benefits - Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Pension        
Components of net periodic benefit cost:        
Service cost $ 12 $ 14 $ 24 $ 27
Interest cost 12 10 25 20
Expected return on plan assets (25) (26) (52) (51)
Amortization of actuarial loss (gain) 6 13 13 26
Amortization of prior service cost 0 1 0 1
Total net periodic benefit cost 5 12 10 23
Other Postretirement Benefits        
Components of net periodic benefit cost:        
Service cost 1 2 3 4
Interest cost 4 2 7 5
Expected return on plan assets (7) (6) (13) (13)
Amortization of actuarial loss (gain) (1) 0 (2) 0
Amortization of prior service cost 0 0 0 0
Total net periodic benefit cost $ (3) $ (2) $ (5) $ (4)