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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 5 $ 6 $ 11 $ 12
Interest cost 22 22 43 45
Expected return on plan assets (31) (30) (62) (60)
Amortization of actuarial loss 6 6 12 13
Net periodic pension cost 2 4 4 10
Pension Plan | Qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 6 10 11
Interest cost 21 21 41 42
Expected return on plan assets (31) (30) (62) (60)
Amortization of actuarial loss 6 6 11 12
Net periodic pension cost 0 3 0 5
Supplemental Employee Retirement Plan | Non-qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 0 1 1
Interest cost 1 1 2 3
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 0 0 1 1
Net periodic pension cost $ 2 $ 1 $ 4 $ 5