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Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 5 $ 6
Interest cost 21 21
Expected return on plan assets (31) (31)
Amortization of actuarial loss 6 6
Net periodic pension (benefit) cost 1 2
Pension Plan | Qualified Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 5 6
Interest cost 20 20
Expected return on plan assets (31) (31)
Amortization of actuarial loss 5 5
Net periodic pension (benefit) cost (1) 0
Supplemental Employee Retirement Plan | Non-qualified Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 1 1
Expected return on plan assets 0 0
Amortization of actuarial loss 1 1
Net periodic pension (benefit) cost $ 2 $ 2