Supplementary Financial Information (Schedule Of Other Income And Deductions) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Supplementary Financial Information [Abstract]
Accretion of fair value adjustment (discount) to regulatory assets due to purchase accounting	$ 1	$ 3	$ 4	$ 6
Other				1
Total other income	1	3	4	7
Professional fees	5	4	7	7
Other	2		5
Total other deductions	$ 7	$ 4	$ 12	$ 7