Natural Gas and Oil Property Transactions - Narrative (Details) (USD $)	9 Months Ended		1 Months Ended		3 Months Ended									9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jul. 31, 2008 Minimum [Member]	Jul. 31, 2008 Maximum [Member]	Sep. 30, 2014 RKI Exploration & Production, LLC [Member] acre	Sep. 30, 2014 RKI Exploration & Production, LLC [Member] RKI Obligation [Member] acre well	Sep. 30, 2014 RKI Exploration & Production, LLC [Member] Chesapeake Obligation [Member] acre well	Sep. 30, 2014 Rice Drilling [Member]	Sep. 30, 2014 Hilcorp Energy [Member]	Sep. 30, 2014 Hilcorp Energy [Member] Compressor [Member] Compressor	Sep. 30, 2013 Haynesville Shale [Member]	Sep. 30, 2013 Northern Eagle Ford Shale [Member]	Sep. 30, 2013 Corporate Joint Venture [Member] acre	Sep. 30, 2014 Corporate Joint Venture [Member] Joint_Venture Resource_Plays	Sep. 30, 2013 Corporate Joint Venture [Member] acre	Sep. 30, 2013 JV Mississippian Lime [Member]	Sep. 30, 2013 JV Mississippian Lime [Member] Payment Remaining [Member]	Sep. 30, 2013 JV Mississippian Lime [Member] Closing adjustments between the effective date and the closing date transaction [Member]	Sep. 30, 2014 JV Utica [Member]	Sep. 30, 2014 JV Marcellus, Barnett, Utica, Eagle Ford, Mid-Continent [Member]	Sep. 30, 2013 JV Marcellus, Barnett, Utica, Eagle Ford, Mid-Continent [Member]	Sep. 30, 2014 Corporate VPP [Member]
Business Acquisition [Line Items]
Number Of Gross Acres					440,000
Number Of Net Acres						203,000	137,000
Number of Wells, Gross						186	67
Interest Sold			20.00%	50.00%		48.00%	22.00%
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds							$ 450,000,000
Proceeds from divestitures of proved and unproved properties	723,000,000	2,789,000,000						233,000,000	133,000,000		257,000,000	617,000,000		335,000,000	800,000,000
Equipment, Number of Units										61
Number of Joint Ventures														8
Number of Resource Plays														8
Proceeds from Divestiture of Interest in Joint Venture														8,000,000,000		949,000,000	71,000,000	90,000,000		24,000,000	48,000,000
Total Drilling Carries	9,000,000,000
Oil And Gas Benefit From Drilling Carries													669,000,000	535,000,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners																50.00%
Gas and Oil Area, Developed, Net													850,000		850,000
Gain (Loss) on Disposition of Other Assets																						0
Drilling Carries Remaining																			$ 195,000,000
Percentage of Total Payment by Joint Venture Partner																			60.00%