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Retirement Benefits (Accumulated Benefit Obligation In Excess of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation   $ 55 $ 52
Fair value of plan assets $ 44 45  
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation 195 208 208
Fair value of plan assets 311 291 270
Funded Plans [Member] | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 50 55  
Accumulated benefit obligation 50 55  
Fair value of plan assets 44 45 43
Unfunded Plans [Member] | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Projected benefit obligation 26 31  
Accumulated benefit obligation 26 31 34
Fair value of plan assets $ 0 $ 0 $ 0