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Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 5 $ 5 $ 10 $ 11
Interest cost 21 22 42 43
Expected return on plan assets (31) (31) (62) (62)
Amortization of actuarial loss 6 6 12 12
Net periodic pension cost 1 2 2 4
Pension Plan | Qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 5 4 10 10
Interest cost 20 21 40 41
Expected return on plan assets (31) (31) (62) (62)
Amortization of actuarial loss 6 6 11 11
Net periodic pension cost 0 0 (1) 0
Supplemental Employee Retirement Plan | Non-qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 0 1
Interest cost 1 1 2 2
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 0 0 1 1
Net periodic pension cost $ 1 $ 2 $ 3 $ 4