v3.26.1
Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 5 $ 5
Interest cost 19 21
Expected return on plan assets (33) (31)
Amortization of actuarial loss 5 6
Net periodic pension (benefit) cost (4) 1
Pension Plan | Qualified Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 5 5
Interest cost 18 20
Expected return on plan assets (33) (31)
Amortization of actuarial loss 4 5
Net periodic pension (benefit) cost (6) (1)
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