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Asset Impairment Expense (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2012 | Sep. 30, 2012 | Sep. 30, 2011
Asset Impairment Expense [Line Items] |  |  |  |  |
Asset Impairment Charges | $ 43 | $ 130 |  | $ 72 | $ 163
Wind turbines and projects [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Asset Impairment Charges | 36 | 116 |  | 40 | 116
Wind Turbines [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Asset Impairment Charges |  | 116 |  | 20 |
Fair Value | 25 |  |  | 25 |
Carrying Amount | 45 |  |  | 45 |
Wind projects [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  |  | 16 |
St Patrick [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Asset Impairment Charges | 0 | 0 | 11 | 11 | 0
Fair Value |  |  | 22 |  |
Carrying Amount |  |  | 33 |  |
Kelanitissa [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Asset Impairment Charges | 5 | 4 |  | 17 | 37
Fair Value | 10 |  |  | 10 |
Carrying Amount | 22 |  |  | 22 |
Other Impairment [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Asset Impairment Charges | $ 2 | $ 10 |  | $ 4 | $ 10

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- Definition This element represents the aggregate carrying amount of the assets measured at fair value on a nonrecurring basis by the entity before the recognition of impairment charges. + References No definition available. + Details
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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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