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Supplemental Oil And Gas Information (Schedule Of Net Proved Oil And Gas Reserves And The Changes In Net Proved Oil And Gas Reserves) (Details)	12 Months Ended
	Dec. 31, 2012 MBbls MBoe	Dec. 31, 2011 MBbls MBoe	Dec. 31, 2010 MBbls MBoe	Dec. 31, 2009 MBoe MBbls
Reserve Quantities [Line Items]
Proved reserves	2,592	2,500	2,293
Revisions of previous estimates	(327)	11	350
Extensions and discoveries	186	274	35
Production	(234)	(193)	(178)
Proved reserves	2,217	2,592	2,500	2,293
Proved developed reserves (equivalent)	1,826	1,940	1,804	1,599
Proved undeveloped reserves (equivalent)	391	652	696	694
Oil [Member]
Reserve Quantities [Line Items]
Proved reserves	2,591	2,496	2,273
Revisions of previous estimates	(337)	10	360
Extensions and discoveries	186	274	37
Production	(227)	(189)	(174)
Proved reserves	2,213	2,591	2,496
Proved developed reserves (volume)	1,822	1,939	1,800	1,579
Proved undeveloped reserves (volume)	391	652	696	694
Gas [Member]
Reserve Quantities [Line Items]
Proved reserves	4	27	116
Revisions of previous estimates	61	3	(64)
Production	(43)	(26)	(25)
Proved reserves	22	4	27
Proved developed reserves (volume)	22	4	27	116

X

- Definition

Energy measure of interests in proved developed reserves of 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.

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Energy measure of proved undeveloped reserves of 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.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

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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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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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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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