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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 33 $ 31 $ 101 $ 93
Interest cost 57 53 172 163
Expected return on plan assets (69) (62) (207) (188)
Amortization of unrecognized (gain) loss 4 2 14 6
Amortization of prior service (credit) cost 0 1 0 1
Other 1 1 1 2
Total 26 26 81 77
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 3
Interest cost 9 10 28 31
Expected return on plan assets 0 0 (1) (1)
Amortization of unrecognized (gain) loss (7) (9) (20) (28)
Amortization of prior service (credit) cost (23) (28) (70) (84)
Other 0 0 0 0
Total $ (20) $ (26) $ (59) $ (79)