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Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 6 $ 6 $ 17 $ 18
Interest cost 23 24 66 69
Expected return on plan assets (31) (30) (93) (90)
Amortization of actuarial loss 7 7 19 20
Settlement charge 0 7 0 7
Net periodic pension cost 5 14 9 24
Pension Plan | Qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 6 6 16 17
Interest cost 21 22 62 64
Expected return on plan assets (31) (30) (93) (90)
Amortization of actuarial loss 7 5 18 17
Settlement charge 0 0 0 0
Net periodic pension cost 3 3 3 8
Supplemental Employee Retirement Plan | Non-qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 1 1
Interest cost 2 2 4 5
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 0 2 1 3
Settlement charge 0 7 0 7
Net periodic pension cost $ 2 $ 11 $ 6 $ 16