Interest And Other Income (Components Of Interest And Other Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Interest and Other Income [Abstract]
Equity interest in income of unconsolidated affiliate	$ 3	[1]	$ 3	[1]
Other income	1		2
Deferred compensation plan income	2		2
Third-party income (loss) from vertical integration services	(2)	[2]	(7)	[2]
Total interest and other income	4		0
GrossRevenuesIncludedInThirdPartyIncomeFromVerticalIntegrationServices	92		56
GrossExpensesIncludedInThirdPartyIncomeFromVerticalIntegrationServices	$ 94		$ 63

[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)Loss from vertical integration services represents net margins that result from Company-provided fracture stimulation, drilling 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 months ended March 31, 2014, these net margins included $92 million of gross vertical integration revenues and $94 million of total vertical integration costs and expenses. For the same periods in 2013, these net margins included $56 million of gross vertical integration revenues and $63 million of total vertical integration costs and expenses.