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Retirement Benefits (Accumulated Benefit Obligation In Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation   $ 23 $ 22
Fair value of plan assets $ 182 22  
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 127 138 148
Fair value of plan assets 295 277 259
Funded Plans [Member] | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 22 23  
Accumulated benefit obligation 158 23  
Fair value of plan assets 182 22 20
Unfunded Plans [Member] | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 16 15  
Accumulated benefit obligation 16 17 19
Fair value of plan assets $ 0 $ 0 $ 0