Supplementary Oil And Natural Gas Disclosures (Unaudited) (Schedule Of Proved Developed And Undeveloped Oil And Gas Reserves) (Details)	12 Months Ended
Dec. 31, 2011 MBbls MMcf	Dec. 31, 2010 MMcf MBbls
Proved Developed and Undeveloped Reserves [Abstract]
Beginning balance	5,301
Purchase of reserves in place		4,377
Revisions	887	1,572
Production	(439)	(648)
Ending balance	6,268	5,301
Proved-developed reserves:
Proved Developed Reserves (Volume)	3,229	3,848
Proved-undeveloped reserves:
Proved Undeveloped Reserve (Volume)	3,039	1,453
Equity Method Investments [Member]
Proved Developed and Undeveloped Reserves [Abstract]
Beginning balance	20,111	23,255
Purchase of reserves in place	958	34
Revisions	412	564
Extensions, discoveries and other additions		413
Change in ownership percentage		(32)
Production	(399)	(413)
Sale of reserves in-place	(1,159)
Ending balance	18,236	20,111
Proved-developed reserves:
Proved Developed Reserves (Volume)	14,695	18,228
Proved-undeveloped reserves:
Proved Undeveloped Reserve (Volume)	3,542	1,885

Proved developed and undeveloped reserves change in ownership percentage.

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Additions to proved reserves that result from (1) extension of the proved acreage of previously discovered (old) reservoirs through additional drilling in periods after discovery and (2) discovery of new fields with proved reserves or of new reservoirs of proved reserves in old fields.

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The net quantity of proved reserves as of the balance sheet date. Proved oil reserves are the estimated quantities of crude oil and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable.

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Production of proved reserves.

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Purchase of minerals in place.

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Revisions represent changes in previous estimates of proved reserves, either upward or downward, resulting from new information (except for an increase in proved acreage) normally obtained from development drilling and production history or resulting from change in economic factors.

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Sales of minerals in place.

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Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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Net quantities of an enterprise's interests in proved undeveloped reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other renewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves.

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