Interest And Other Income (Components Of Interest And Other Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Interest and Other Income [Abstract]
Other income	$ 1		$ 2		$ 5		$ 6
Equity interest in income of unconsolidated affiliate	3	[1]	4	[1]	10	[1]	10	[1]
Deferred compensation plan income	0		0		3		2
Third-party income (loss) from vertical integration services	(2)	[2]	2	[2]	(9)	[2]	(15)	[2]
Total interest and other income	2		8		9		3
GrossRevenuesIncludedInThirdPartyIncomeFromVerticalIntegrationServices	125		103		321		206
GrossExpensesIncludedInThirdPartyIncomeFromVerticalIntegrationServices	$ 127		$ 101		$ 330		$ 221

[1] (a)The Company accounts for its investment in EFS Midstream LLC ("EFS Midstream") using the equity method. EFS Midstream is providing gathering, treating and transportation services for the Company during a 20-year contractual term.

[2] (b)Income (loss) from vertical integration services primarily represents net margins that result from Company-provided fracture stimulation and related service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three and nine months ended September 30, 2014, these net margins included $125 million and $321 million of gross vertical integration revenues, respectively, and $127 million and $330 million of total vertical integration costs and expenses, respectively. For the same periods in 2013, these net margins included $103 million and $206 million of gross vertical integration revenues, respectively, and $101 million and $221 million of total vertical integration costs and expenses, respectively.