Interest And Other Income (Components Of Interest And Other Income) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest and Other Income [Abstract]
Interest income		$ 5	$ 2	$ 14	$ 2
Deferred compensation plan income		0	0	2	4
Equity interest in income of unconsolidated affiliate	[1]	0	0	0	5
Other income		2	0	5	5
Total interest and other income		$ 7	$ 2	$ 21	$ 16

[1] (a)The Company accounted for its investment in EFS Midstream prior to its sale in July 2015 using the equity method. EFS Midstream provided gathering, treating and transportation services for the Company. See Note C for additional information on the Company's sale of EFS Midstream.