Natural Gas and Oil Property Divestitures - Joint Ventures Table (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013 JV Mississippi Lime	Dec. 31, 2013 JV Mississippi Lime	Dec. 31, 2011 JV Utica	Dec. 31, 2013 JV Utica	Feb. 28, 2011 JV Niobrara	Dec. 31, 2013 JV Niobrara	Nov. 30, 2010 JV Eagle Ford	Dec. 31, 2013 JV Eagle Ford	Jan. 31, 2010 JV Barnett Shale	Dec. 31, 2013 JV Barnett Shale	Nov. 30, 2008 JVMarcellus	Dec. 31, 2013 JVMarcellus	Sep. 30, 2008 JV Fayetteville	Dec. 31, 2013 JV Fayetteville	Jul. 31, 2008 JV Haynesville And Bossier	Dec. 31, 2013 JV Haynesville And Bossier	Dec. 31, 2013 Payment Remaining [Member] JV Mississippi Lime	Dec. 31, 2013 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	$ 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	$ 731		$ 0		$ 596		$ 135		$ 0		$ 0		$ 0		$ 0		$ 0
Percentage of Total Payment by Joint Venture Partner																		7.00%
Percentage Reimbursed					60.00%		67.00%