Natural Gas and Oil Property Divestitures - Joint Ventures Table (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 JV Mississippi Lime	Jun. 30, 2013 JV Mississippi Lime	Dec. 31, 2011 JV Utica	Mar. 31, 2014 JV Utica	Feb. 28, 2011 JV Niobrara	Mar. 31, 2014 JV Niobrara	Nov. 30, 2010 JV Eagle Ford	Mar. 31, 2014 JV Eagle Ford	Jan. 31, 2010 JV Barnett Shale	Mar. 31, 2014 JV Barnett Shale	Nov. 30, 2008 JVMarcellus	Mar. 31, 2014 JVMarcellus	Sep. 30, 2008 JV Fayetteville	Mar. 31, 2014 JV Fayetteville	Jul. 31, 2008 JV Haynesville And Bossier	Mar. 31, 2014 JV Haynesville And Bossier	Mar. 31, 2014 Payment Remaining [Member] JV Mississippi Lime	Mar. 31, 2014 Closing adjustments between the effective date and the closing date transaction [Member] JV Mississippi Lime
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	$ 542	$ 0			$ 478		$ 64		$ 0		$ 0		$ 0		$ 0		$ 0
Percentage of Total Payment by Joint Venture Partner																		7.00%
Percentage Reimbursed					60.00%		67.00%