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Retirement Benefits (Net Periodic Benefit Costs Schedule) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 1 2
Expected return on plan assets (1) (2)
Prior service cost amortization 0 0
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit 0 0
Net periodic benefit cost 0 0
Other Postretirement Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 0 1
Interest cost 6 4
Expected return on plan assets (12) (11)
Prior service cost amortization 2 19
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit (1) 0
Net periodic benefit cost $ (5) $ 13