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Retirement Benefits (Net Periodic Benefit Costs Schedule) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 1 $ 0
Interest cost 6 1
Expected return on plan assets (8) (1)
Prior service cost amortization (2) 0
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit 0 0
Settlements 2 0
Net periodic benefit cost (1) 0
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 0
Interest cost 7 6
Expected return on plan assets (13) (12)
Prior service cost amortization 2 2
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit (1) (1)
Settlements 0 0
Net periodic benefit cost $ (5) $ (5)