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Acquisitions And Divestitures (Schedule Of Purchase Price Allocation For GeoSouthern Intermediate Holdings) (Details) (GeoSouthern Intermediate Holdings, LLC [Member], USD $) In Millions, unless otherwise specified	Feb. 28, 2014
GeoSouthern Intermediate Holdings, LLC [Member]
Business Acquisition [Line Items]
Cash and cash equivalents	$ 95
Other current assets	256
Proved properties	5,029
Unproved properties	1,008
Midstream assets	85
Current liabilities	(437)
Long-term liabilities	(6)
Net assets acquired	$ 6,030

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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