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USD ($)
USD ($) / shares
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{us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis} : Variable Interest Entity Bankruptcy Remote Special Purpose Subsidiary Primary Beneficiary Member
12/31/2010
USD ($)
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{us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis} : Variable Interest Entity Bankruptcy Remote Special Purpose Subsidiary Primary Beneficiary Member
12/31/2007
USD ($)
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{us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis} : Qualifying facility 1 [Member]
1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis} : Qualifying facility 1 [Member]
1/1/2009 - 12/31/2009
USD ($)
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{us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis} : Qualifying facility 1 [Member]
1/1/2008 - 12/31/2008
USD ($)
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{us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis} : Variable Interest Entity Qualifying Facility Not Primary Beneficiary Member
1/1/2010 - 12/31/2010
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1/1/2010 - 12/31/2010
USD ($)
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{us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis} : Variable Interest Entities Gas And Oil Primary Beneficiary Member
1/1/2010 - 12/31/2010
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{us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis} : Variable Interest Entities Wind Primary Beneficiary Member
1/1/2010 - 12/31/2010
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tyAxis} : Variable Interest Entity Other Member
12/31/2010
USD ($)
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Knowntruetrue
