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Comprehensive Income (Schedule Of Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Provision for income taxes $ (9) $ (6)
Net Income 70 40
Amount Reclassified from Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net Income   (1)
Unrealized Gains (Losses) on Derivatives [Member] | Amount Reclassified from Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Net losses on derivatives   (1)
Provision for income taxes  
Net Income   (1)
Unrealized Gains (Losses) on Derivatives [Member] | Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Fuel Swap Contracts [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Gains (losses) on derivatives: (1)
Unrealized Gains (Losses) on Derivatives [Member] | Amount Reclassified from Accumulated Other Comprehensive Income [Member] | Interest Rate Swap Contracts [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Gains (losses) on derivatives: $ 1 $ (1)