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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 51 $ 59   $ 153 $ 179
Interest cost 47 46   141 138
Expected return on plan assets (76) (70)   (230) (212)
Amortization of unrecognized (gain) loss 29 42   90 127
Amortization of prior service credit 0 0   0 0
Special termination benefits       0 0
Other 2 2   3 3
Total 53 79   157 235
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 2 2   6 7
Interest cost 8 6   23 19
Expected return on plan assets 0 0   (1) (1)
Amortization of unrecognized (gain) loss (3) (7)   (10) (21)
Amortization of prior service credit (28) (30)   (84) (92)
Special termination benefits     $ 46 0 46
Other 0 0   0 0
Total $ (21) $ (29)   $ (66) $ (42)