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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 5 $ 6 $ 15 $ 17
Interest cost 22 23 64 66
Expected return on plan assets (30) (31) (92) (93)
Amortization of actuarial loss 6 7 18 19
Net periodic pension cost 3 5 5 9
Pension Plan | Qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 6 14 16
Interest cost 21 21 61 62
Expected return on plan assets (30) (31) (92) (93)
Amortization of actuarial loss 6 7 17 18
Net periodic pension cost 1 3 0 3
Supplemental Employee Retirement Plan | Non-qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 0 1 1
Interest cost 1 2 3 4
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 0 0 1 1
Net periodic pension cost $ 2 $ 2 $ 5 $ 6