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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
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 -Paragraph 14

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 03
 -Paragraph 7
 -Subparagraph a, b
 -Article 5

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1/1/2010 - 12/31/2010
USD ($)

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1/1/2009 - 12/31/2009
USD ($)

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1/1/2008 - 12/31/2008
USD ($)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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 -Name Regulation S-X (SX)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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1/1/2010 - 12/31/2010
USD ($)

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1/1/2009 - 12/31/2009
USD ($)

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1/1/2008 - 12/31/2008
USD ($)

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{invest_InvestmentAxis} : Nuclear Decommissioning Trust Investments [Member]
1/1/2010 - 12/31/2010
USD ($)
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1/1/2009 - 12/31/2009
USD ($)
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{invest_InvestmentAxis} : Nuclear Decommissioning Trust Investments [Member]
1/1/2008 - 12/31/2008
USD ($)
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 115
 -Paragraph 14

Reference 2: http://www.xbrl.org/2003/role/presentationRef
 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 03
 -Paragraph 7
 -Subparagraph a, b
 -Article 5

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1/1/2010 - 12/31/2010
USD ($)

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1/1/2009 - 12/31/2009
USD ($)

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1/1/2008 - 12/31/2008
USD ($)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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