The value (monetary amount) of the award the plaintiff seeks in the legal matter.

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+ Details

Commitments and Contingencies (Details) (USD $)	1 Months Ended	12 Months Ended	1 Months Ended	29 Months Ended	58 Months Ended	86 Months Ended	9 Months Ended
Commitments and Contingencies (Details) (USD $)	Feb. 28, 2002 California Department of Water Resources	Dec. 31, 2006 California Department of Water Resources	Feb. 28, 2011 Louisiana Generating, LLC	Jun. 30, 2011 Louisiana Generating, LLC	Jan. 12, 2009 Louisiana Generating, LLC	Mar. 15, 2004 Louisiana Generating, LLC	Sep. 30, 2011 Excess Mitigation Credits	Sep. 30, 2011 Excess Mitigation Credits [Domain]
Louisiana Generating, LLC
Civil penalties, CAA violations (in dollars per day)				$ 37,500	$ 32,500	$ 27,500
Number of motions filed by U.S.DOJ			3
California Department of Water Resources
Damages alleged	$ 940,000,000						$ 5,000,000	$ 385,000,000
Percentage of ownership acquired by the company from another party (as a percent)		50.00%