Supplemental Oil and Gas Information (Unaudited) Reserve Rollforward (Details)	12 Months Ended
	Dec. 31, 2013 Mcf		Dec. 31, 2012 Mcf		Dec. 31, 2011 Mcf
Reserve Quantities [Line Items]
Revisions, Removal of Proved Undeveloped Reserves not Developed	76		250
Percentage of ownership interest	100.00%
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Revisions, Changes in Performance	74		291
U.S. [Member] | Proved Developed [Member]
Reserve Quantities [Line Items]
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions, Percent			13.00%
U.S. [Member] | Natural Gas [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	848,048		1,828,904		1,941,723
Revisions	234,835	[1]	(910,386)	[1]	(172,643)	[1]
Extensions and discoveries	50,992	[2]	25,858	[2]	155,662	[2]
Sales in place	(257,741)	[3]	(20,616)	[4]
Production	(51,684)		(75,712)		(95,838)
Proved Reserves, End of Period	824,450		848,048		1,828,904
Proved Developed Reserves (Volume)	702,147		725,361		1,244,187
Proved Undeveloped Reserve (Volume)	122,303		122,687		584,717
U.S. [Member] | NGL [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	56,173		102,145		112,444
Revisions	750	[1]	(45,379)	[1]	(8,519)	[1]
Extensions and discoveries	0	[2]	3,518	[2]	2,652	[2]
Sales in place	(14,333)	[3]	(42)	[4]
Production	(2,856)		(4,069)		(4,432)
Proved Reserves, End of Period	39,734		56,173		102,145
Proved Developed Reserves (Volume)	34,603		47,284		60,902
Proved Undeveloped Reserve (Volume)	5,131		8,890		41,243
U.S. [Member] | Oil [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	2,529		3,035		3,308
Revisions	62	[1]	(479)	[1]	(43)	[1]
Extensions and discoveries	0	[2]	345	[2]	43	[2]
Sales in place	(2,207)	[3]	(85)	[4]
Production	(185)		(287)		(273)
Proved Reserves, End of Period	199		2,529		3,035
Proved Developed Reserves (Volume)	139		2,416		2,545
Proved Undeveloped Reserve (Volume)	60		113		490
Canada [Member] | Natural Gas [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	266,783		330,631		265,888
Revisions	28,648	[1]	(33,945)	[1]	15,066	[1]
Extensions and discoveries	9,697	[2]	9	[2]	76,067	[2]
Sales in place	0	[3]	0	[4]
Production	(39,372)		(29,912)		(26,390)
Proved Reserves, End of Period	265,756		266,783		330,631
Proved Developed Reserves (Volume)	260,159		266,783		299,371
Proved Undeveloped Reserve (Volume)	5,896		0		31,260
Canada [Member] | NGL [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	10		11		12
Revisions	0	[1]	1	[1]	1	[1]
Extensions and discoveries	0	[2]	0	[2]	0	[2]
Sales in place	0	[3]	0	[4]
Production	(1)		(2)		(2)
Proved Reserves, End of Period	9		10		11
Proved Developed Reserves (Volume)	9		10		11
Proved Undeveloped Reserve (Volume)	0		0		0
Canada [Member] | Oil [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	0		0		0
Revisions	0	[1]	0	[1]	0	[1]
Extensions and discoveries	0	[2]	0	[2]	0	[2]
Sales in place	0	[3]	0	[4]
Production	0		0		0
Proved Reserves, End of Period	0		0		0
Proved Developed Reserves (Volume)	0		0		0
Proved Undeveloped Reserve (Volume)	0		0		0
Consolidated [Member] | Natural Gas [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	1,114,831		2,159,535		2,207,611
Revisions	263,483	[1]	(944,331)	[1]	(157,577)	[1]
Extensions and discoveries	60,689	[2]	25,867	[2]	231,729	[2]
Sales in place	(257,741)	[3]	(20,616)	[4]
Production	(91,056)		(105,624)		(122,228)
Proved Reserves, End of Period	1,090,206		1,114,831		2,159,535
Proved Developed Reserves (Volume)	962,306		992,144		1,543,558
Proved Undeveloped Reserve (Volume)	128,199		122,687		615,977
Consolidated [Member] | NGL [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	56,183		102,156		112,456
Revisions	750	[1]	(45,378)	[1]	(8,518)	[1]
Extensions and discoveries	0	[2]	3,518	[2]	2,652	[2]
Sales in place	(14,333)	[3]	(42)	[4]
Production	(2,857)		(4,071)		(4,434)
Proved Reserves, End of Period	39,743		56,183		102,156
Proved Developed Reserves (Volume)	34,612		47,294		60,913
Proved Undeveloped Reserve (Volume)	5,131		8,890		41,243
Consolidated [Member] | Oil [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves, Beginning of Period	2,529		3,035		3,308
Revisions	62	[1]	(479)	[1]	(43)	[1]
Extensions and discoveries	0	[2]	345	[2]	43	[2]
Sales in place	(2,207)	[3]	(85)	[4]
Production	(185)		(287)		(273)
Proved Reserves, End of Period	199		2,529		3,035
Proved Developed Reserves (Volume)	139		2,416		2,545
Proved Undeveloped Reserve (Volume)	60		113		490
Changes in Non-Economic Factors [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Revisions	(151,615)		(629,407)		(154,405)
Changes in Economic Factors [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Revisions	419,972		(590,064)		(54,539)
Barnett Shale [Member] | U.S. [Member]
Reserve Quantities [Line Items]
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions, Percent			96.00%		100.00%
Barnett Shale [Member] | U.S. [Member] | Proved Developed [Member]
Reserve Quantities [Line Items]
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions, Percent					11.00%
Niobrara and West Texas Assets [Member] | U.S. [Member]
Reserve Quantities [Line Items]
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions, Percent			4.00%
Tokyo Gas [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Sales in place	337
Synergy [Member]
Change in Proved Developed and Undeveloped Reserves [Roll Forward]
Sales in place	15

[1] Revisions for each period presented reflect upward (downward) changes in previous estimates attributable to changes in economic factors of 419,972 MMcfe, (590,064) MMcfe and (54,539) MMcfe in 2013, 2012 and 2011, respectively, and changes in non-economic factors of (151,615) MMcfe, (629,407) MMcfe and (154,405) MMcfe in 2013, 2012 and 2011, respectively, including:•Removal of proved undeveloped reserves that had not been developed within five years: (76) Bcfe and (250) Bcfe in 2013 and 2012, respectively;•changes in performance related to offsetting activities, higher pipeline pressures and other factors: (74) Bcfe and (291) Bcfe in 2013 and 2012, respectively and•revision of type curve of non producing wells based on comparison to producing analogs: (88) Bcfe in 2012.

[2] Extensions and discoveries for each period presented represent extensions to reserves attributable to additional drilling activity subsequent to discovery. U.S. extensions and discoveries for:•2013 are attributable to our Barnett Shale Asset;•2012 are 96% attributable to our Barnett Shale Asset, 4% to our Niobrara and West Texas Assets (of which 13% were proved developed); and•2011 are 100% attributable to our Barnett Shale Asset (of which 11% were proved developed).Canadian extensions and discoveries for:•2013 and 2012 are attributable to our Horseshoe Canyon Asset; and•2011 are 97% attributable to our Horn River Asset and 3% are attributable to our Horseshoe Canyon Asset

[3] Sales of reserves in place during 2013 relate to the Tokyo Gas Transaction (337 Bcfe) and the Synergy Transaction (15 Bcfe).

[4] Sales of reserves in place during 2012 relate to our agreement to allow an outside working interest owner to fund the completion costs for twelve wells in our Barnett Shale Asset for which they received a preferential right to reserves. It also includes a minimal sale of reserves in our Niobrara Asset to SWEPI.