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Natural Gas and Oil Property Divestitures - VPP Transactions Table (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended				3 Months Ended				3 Months Ended					3 Months Ended				3 Months Ended					3 Months Ended					3 Months Ended				3 Months Ended					3 Months Ended					3 Months Ended
	Jun. 30, 2014 Mcfe	Jun. 30, 2014 Natural Gas [Member] Mcf	Jun. 30, 2014 Oil [Member] MBbls	Jun. 30, 2014 NGL Reserves [Member] MBbls	Mar. 31, 2012 VPP 10 Aradarko Basin Granite Wash [Member] Mcfe	Mar. 31, 2012 VPP 10 Aradarko Basin Granite Wash [Member] Natural Gas [Member] Mcf	Mar. 31, 2012 VPP 10 Aradarko Basin Granite Wash [Member] Oil [Member] MBbls	Mar. 31, 2012 VPP 10 Aradarko Basin Granite Wash [Member] NGL Reserves [Member] MBbls	Jun. 30, 2011 VPP 9 Mid-Continent [Member]	May 31, 2011 VPP 9 Mid-Continent [Member] Mcfe	May 31, 2011 VPP 9 Mid-Continent [Member] Natural Gas [Member] Mcf	May 31, 2011 VPP 9 Mid-Continent [Member] Oil [Member] MBbls	May 31, 2011 VPP 9 Mid-Continent [Member] NGL Reserves [Member] MBbls	Sep. 30, 2010 VPP 8 Barnett Shale [Member] Mcfe	Sep. 30, 2010 VPP 8 Barnett Shale [Member] Natural Gas [Member] Mcf	Sep. 30, 2010 VPP 8 Barnett Shale [Member] Oil [Member] MBbls	Sep. 30, 2010 VPP 8 Barnett Shale [Member] NGL Reserves [Member] MBbls	Mar. 31, 2010 VPP 6 East Texas and Texas Gulf Coast [Member]	Feb. 28, 2010 VPP 6 East Texas and Texas Gulf Coast [Member] Mcfe	Feb. 28, 2010 VPP 6 East Texas and Texas Gulf Coast [Member] Natural Gas [Member] Mcf	Feb. 28, 2010 VPP 6 East Texas and Texas Gulf Coast [Member] Oil [Member] MBbls	Feb. 28, 2010 VPP 6 East Texas and Texas Gulf Coast [Member] NGL Reserves [Member] MBbls	Sep. 30, 2009 VPP 5 South Texas [Member]	Aug. 31, 2009 VPP 5 South Texas [Member] Mcfe	Aug. 31, 2009 VPP 5 South Texas [Member] Natural Gas [Member] Mcf	Aug. 31, 2009 VPP 5 South Texas [Member] Oil [Member] MBbls	Aug. 31, 2009 VPP 5 South Texas [Member] NGL Reserves [Member] MBbls	Dec. 31, 2008 VPP 4 Anadarko and Arkoma Basins [Member] Mcfe	Dec. 31, 2008 VPP 4 Anadarko and Arkoma Basins [Member] Natural Gas [Member] Mcf	Dec. 31, 2008 VPP 4 Anadarko and Arkoma Basins [Member] Oil [Member] MBbls	Dec. 31, 2008 VPP 4 Anadarko and Arkoma Basins [Member] NGL Reserves [Member] MBbls	Sep. 30, 2008 VPP 3 Anadarko Basin [Member]	Aug. 31, 2008 VPP 3 Anadarko Basin [Member] Mcfe	Aug. 31, 2008 VPP 3 Anadarko Basin [Member] Natural Gas [Member] Mcf	Aug. 31, 2008 VPP 3 Anadarko Basin [Member] Oil [Member] MBbls	Aug. 31, 2008 VPP 3 Anadarko Basin [Member] NGL Reserves [Member] MBbls	Jun. 30, 2008 VPP 2 Texas, Oklahoma and Kansas [Member]	May 31, 2008 VPP 2 Texas, Oklahoma and Kansas [Member] Mcfe	May 31, 2008 VPP 2 Texas, Oklahoma and Kansas [Member] Natural Gas [Member] Mcf	May 31, 2008 VPP 2 Texas, Oklahoma and Kansas [Member] Oil [Member] MBbls	May 31, 2008 VPP 2 Texas, Oklahoma and Kansas [Member] NGL Reserves [Member] MBbls	Dec. 31, 2007 VPP 1 Kentucky and West Virginia [Member] Mcfe	Dec. 31, 2007 VPP 1 Kentucky and West Virginia [Member] Natural Gas [Member] Mcf	Dec. 31, 2007 VPP 1 Kentucky and West Virginia [Member] Oil [Member] MBbls	Dec. 31, 2007 VPP 1 Kentucky and West Virginia [Member] NGL Reserves [Member] MBbls
Business Combination, Separately Recognized Transactions [Line Items]
Cash Proceeds from Volumetric Production Payment (VPP)	$ 6,031				$ 744				$ 853					$ 1,150				$ 180					$ 370					$ 412				$ 600					$ 622					$ 1,100
Proved Developed Reserves (Volume)		1,216,000,000,000	5,700,000	14,000,000		87,000,000,000	3,000,000	9,200,000			138,000,000,000	1,700,000	4,800,000		390,000,000,000	0	0			44,000,000,000	300,000	0			67,000,000,000	200,000	0		95,000,000,000	500,000	0			93,000,000,000	0	0			94,000,000,000	0	0		208,000,000,000	0	0
Proved Developed Reserves (Energy)	1,334,000,000,000				160,000,000,000					177,000,000,000				390,000,000,000					46,000,000,000					68,000,000,000				98,000,000,000					93,000,000,000					94,000,000,000				208,000,000,000

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- Definition

Cash Proceeds from Volumetric Production Payment (VPP)

+ References

No definition available.

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- 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.

+ References

No definition available.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61797-109447



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61884-109447

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