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Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 31 $ 51 $ 93 $ 153
Interest cost 53 47 163 141
Expected return on plan assets (62) (76) (188) (230)
Amortization of unrecognized (gain) loss 2 29 6 90
Amortization of prior service credit 1 0 1 0
Other 1 2 2 3
Total 26 53 77 157
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 2 3 6
Interest cost 10 8 31 23
Expected return on plan assets 0 0 (1) (1)
Amortization of unrecognized (gain) loss (9) (3) (28) (10)
Amortization of prior service credit (28) (28) (84) (84)
Other 0 0 0 0
Total $ (26) $ (21) $ (79) $ (66)