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Comprehensive Income (Loss) (Schedule Of Reclassifications Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense $ (14) $ (16) $ (43) $ (47)
Provision for income taxes (16) (21) (37) (46)
Net Income $ 49 $ 61 111 134
Amount Reclassified from Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net Income     (5) (1)
Unrealized Losses On Derivatives [Member] | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense     (6) (2)
Provision for income taxes     2 0
Net Income     $ (5) $ (1)