Natural Gas and Oil Property Divestitures - Narrative (Details) (USD $)	12 Months Ended					12 Months Ended															1 Months Ended	12 Months Ended						3 Months Ended	12 Months Ended				1 Months Ended		1 Months Ended	3 Months Ended
	Dec. 31, 2013 Mcfe	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Haynesville Shale [Member] acre	Dec. 31, 2013 Northern Eagle Ford Shale [Member] acre	Dec. 31, 2012 Permian Basin [Member]	Dec. 31, 2012 Chitwood Knox [Member] acre	Dec. 31, 2012 XTO Energy Inc. [Member] acre	Dec. 31, 2012 Utica [Member] acre	Dec. 31, 2013 Payment at Closing [Member] MKR Holdings LLC [Member]	Dec. 31, 2013 Payment at Closing [Member] Haynesville Shale [Member]	Dec. 31, 2013 Payment at Closing [Member] Northern Eagle Ford Shale [Member]	Dec. 31, 2012 Cash Payment [Member] Permian Basin [Member]	Dec. 31, 2013 Payment Remaining [Member] Northern Eagle Ford Shale [Member]	Dec. 31, 2012 Payment Remaining [Member] Permian Basin [Member]	Dec. 31, 2013 Subsequent Payment [Member] Haynesville Shale [Member]	Dec. 31, 2013 Subsequent Payment [Member] Northern Eagle Ford Shale [Member]	Dec. 31, 2012 Subsequent Payment [Member] Permian Basin [Member]	Dec. 31, 2012 Payment Received, Additional [Member] Permian Basin [Member]	Dec. 31, 2013 Amount allocated to midstream and other fixed assets [Member] Permian Basin [Member]	Dec. 31, 2011 Corporate Joint Venture [Member]	Dec. 31, 2013 Corporate Joint Venture [Member] acre	Dec. 31, 2012 Corporate Joint Venture [Member]	Dec. 31, 2013 JV Marcellus, Barnett and Utica [Member]	Dec. 31, 2012 JV Marcellus, Barnett and Utica [Member]	Dec. 31, 2011 JV Marcellus, Barnett and Utica [Member]	Dec. 31, 2013 Corporate VPP [Member]	Jun. 30, 2013 JV Mississippi Lime	Dec. 31, 2013 JV Mississippi Lime acre	Dec. 31, 2013 JV Mississippi Lime Payment at Closing [Member]	Dec. 31, 2013 JV Mississippi Lime Payment Remaining [Member]	Dec. 31, 2013 JV Mississippi Lime Closing adjustments between the effective date and the closing date transaction [Member]	Jun. 30, 2010 VPP 7 Permian Basin [Member]	Dec. 31, 2012 VPP 7 Permian Basin [Member] Mcfe	Mar. 31, 2011 Fayetteville Shale [Member] acre Mcfe	Mar. 31, 2011 Fayetteville Shale [Member] mi acre Mcfe
Business Acquisition [Line Items]
Proceeds from divestitures of proved and unproved properties	$ 3,467,000,000	$ 5,884,000,000	$ 7,651,000,000			$ 376,000,000	$ 540,000,000	$ 572,000,000	$ 358,000,000	$ 490,000,000	$ 257,000,000	$ 617,000,000	$ 3,091,000,000	$ 64,000,000	$ 466,000,000	$ 47,000,000	$ 32,000,000	$ 355,000,000	$ 320,000,000	$ 42,000,000															$ 350,000,000	$ 4,650,000,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners																													50.00%
Gas and Oil Area, Developed, Gross																						850,000
Gas and Oil Area, Developed, Net				9,600	55,000		40,000	60,000	72,000																				425,000
Percentage Of Estimated Proved Reserves						6.00%
Proved Developed Reserves (Energy)	1,334,000,000,000																																	28,000,000
Proceeds from Divestiture of Interest in Joint Venture	8,049,000,000																					8,000,000,000		58,000,000	272,000,000	511,000,000		949,000,000	949,000,000	1,020,000,000	71,000,000	90,000,000	313,000,000
Percentage of Total Payment by Joint Venture Partner																															7.00%
Number of Joint Ventures																						8
Total Drilling Carries	9,035,000,000																											0
Oil And Gas Benefit From Drilling Carries																					2,570,000,000	884,000,000	784,000,000
Gain (Loss) on Sale of Other Assets																											$ 0									$ 7,000,000
Net Acres Sold																																			487,000	487,000
Current Net Production (Unit)																																			415	415
Length Of Pipeline																																				420