v3.26.1
Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 4 $ 5 $ 9 $ 10
Interest cost 19 21 38 42
Expected return on plan assets (33) (31) (66) (62)
Amortization of actuarial loss 5 6 10 12
Net periodic pension (benefit) cost (5) 1 (9) 2
Pension Plan | Qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 4 5 9 10
Interest cost 19 20 37 40
Expected return on plan assets (33) (31) (66) (62)
Amortization of actuarial loss 5 6 9 11
Net periodic pension (benefit) cost (5) 0 (11) (1)
Supplemental Employee Retirement Plan | Non-qualified Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost 0 1 1 2
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 0 0 1 1
Net periodic pension (benefit) cost $ 0 $ 1 $ 2 $ 3