Natural Gas and Oil Property Divestitures - Joint Ventures Table (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013 JV Mississippi Lime [Member]	Jun. 30, 2014 JV Mississippi Lime [Member]	Dec. 31, 2011 JV Utica [Member]	Jun. 30, 2014 JV Utica [Member]	Feb. 28, 2011 JV Niobrara [Member]	Jun. 30, 2014 JV Niobrara [Member]	Nov. 30, 2010 JV Eagle Ford [Member]	Jun. 30, 2014 JV Eagle Ford [Member]	Jan. 31, 2010 JV Barnett Shale [Member]	Jun. 30, 2014 JV Barnett Shale [Member]	Nov. 30, 2008 JVMarcellus [Member]	Jun. 30, 2014 JVMarcellus [Member]	Sep. 30, 2008 JV Fayetteville [Member]	Jun. 30, 2014 JV Fayetteville [Member]	Jul. 31, 2008 JV Haynesville And Bossier [Member]	Jun. 30, 2014 JV Haynesville And Bossier [Member]	Jun. 30, 2014 Payment Remaining [Member] JV Mississippi Lime [Member]	Jun. 30, 2014 Closing adjustments between the effective date and the closing date transaction [Member] JV Mississippi Lime [Member]
Joint Ventures [Line Items]
Joint Venture Partner		Sinopec		TOT		CNOOC		CNOOC		TOT		STO		BP		FCX
Joint Venture Date		June 2013		December 2011		February 2011		November 2010		January 2010		November 2008		September 2008		July 2008
Interest Sold		50.00%		25.00%		33.30%		33.30%		25.00%		32.50%		25.00%		20.00%
Proceeds from Divestiture of Interest in Joint Venture	$ 8,049	$ 949		$ 610		$ 570		$ 1,120		$ 800		$ 1,250		$ 1,100		$ 1,650		$ 71	$ 90
Total Drilling Carries	9,035	0		1,422		697		1,080		1,403		2,125		800		1,508
Total Cash And Drilling Carry Proceeds	17,084	949		2,032		1,267		2,200		2,203		3,375		1,900		3,158
Drilling Carries Remaining	$ 373		$ 0		$ 347		$ 26		$ 0		$ 0		$ 0		$ 0		$ 0
Percentage of Total Payment by Joint Venture Partner																		7.00%
Percentage Reimbursed					60.00%		67.00%