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Retirement Benefits (Schedule Of Potential Changes In Key Assumptions) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Service Cost and Interest Cost, .25% decrease in discount rate $ (1)
Defined Benefit Plan Effect Of a Quarter-Percentage Point Decrease of the Discount Rate On the Expected Return on Assets 0
Benefit Obligation, .25% decrease in discount rate 165
Defined Benefit Plan Effect of a Quarter-Percentage Decrease of Return On Assets On the Service and Interest Cost Components 0
Defined Benefit Plan Effect Of a Quarter-Percentage Point Decrease of Return on Assets on the Expected Return on Assets 10
Defined Benefit Plan Effect of a Quarter-Percentage Decrease of Return on Assets on the Projected Benefit Obligation 0
Service Cost and Interest Cost, .25% increase in salary rate 2
Defined Benefit Plan Effect Of a Quarter-Percentage Point Increase of the assumed annual salary increase Rate On the Expected Return on Assets 0
Benefit Obligation, .25% increase in salary rate 14
Service Cost and Interest Cost, 1.00% increase in annual medical trend 0
Defined Benefit Plan, Effect of One Percentage Point Increase on Expected Return on Assets 0
Benefit Obligation, 1.00% increase in annual medical trend 0
Service Cost and Interest Cost, 1.00% decrease in annual medical trend 0
Defined Benefit Plan, Effect of One Percentage Point Decrease on Expected Return on Assets 0
Benefit Obligation, 1.00% decrease in annual medical trend 0
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Service Cost and Interest Cost, .25% decrease in discount rate 0
Defined Benefit Plan Effect Of a Quarter-Percentage Point Decrease of the Discount Rate On the Expected Return on Assets 0
Benefit Obligation, .25% decrease in discount rate 36
Defined Benefit Plan Effect of a Quarter-Percentage Decrease of Return On Assets On the Service and Interest Cost Components 0
Defined Benefit Plan Effect Of a Quarter-Percentage Point Decrease of Return on Assets on the Expected Return on Assets 3
Defined Benefit Plan Effect of a Quarter-Percentage Decrease of Return on Assets on the Projected Benefit Obligation 0
Service Cost and Interest Cost, .25% increase in salary rate 0
Defined Benefit Plan Effect Of a Quarter-Percentage Point Increase of the assumed annual salary increase Rate On the Expected Return on Assets 0
Benefit Obligation, .25% increase in salary rate 0
Service Cost and Interest Cost, 1.00% increase in annual medical trend 3
Defined Benefit Plan, Effect of One Percentage Point Increase on Expected Return on Assets 0
Benefit Obligation, 1.00% increase in annual medical trend 57
Service Cost and Interest Cost, 1.00% decrease in annual medical trend (3)
Defined Benefit Plan, Effect of One Percentage Point Decrease on Expected Return on Assets 0
Benefit Obligation, 1.00% decrease in annual medical trend $ (57)