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Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 6 $ 5
Interest cost 21 23
Expected return on plan assets (31) (30)
Amortization of actuarial loss 6 7
Net periodic pension (benefit) cost 2 5
Pension Plan [Member] | Qualified Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 6 5
Interest cost 20 21
Expected return on plan assets (31) (30)
Amortization of actuarial loss 5 6
Net periodic pension (benefit) cost 0 2
Supplemental Employee Retirement Plan [Member] | Nonqualified Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 1 2
Expected return on plan assets 0 0
Amortization of actuarial loss 1 1
Net periodic pension (benefit) cost $ 2 $ 3