Oil and Gas Exploration and Production Industries Disclosures (Details 1) (Gas) (Natural Gas [Member])	12 Months Ended
	Dec. 31, 2012 MMcf	Dec. 31, 2011 MMcf	Dec. 31, 2010 MMcf
Natural Gas [Member]
Proved developed and undeveloped reserves, Beginning of year	42	44	81
Revisions of Previous Estimates	(36)	7	(28)
Extensions, discoveries and other additions	0	0	0
Production	(6)	(9)	(9)
Proved developed and undeveloped reserves, End of year	0	42	44
Proved developed reserves, Beginning of the year	42	35	43
Proved developed reserves, End of year	0	42	35
Proved undeveloped reserves, Beginning of year	0	8	38
Proved undeveloped reserves, End of year	0	0	8