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Asset Impairment Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Wind turbines and projects [Member] | Dec. 31, 2011 Wind turbines and projects [Member] | Dec. 31, 2010 Wind turbines and projects [Member] | Sep. 30, 2012 Wind Turbines [Member] | Sep. 30, 2012 Wind projects [Member] | Jun. 30, 2012 St Patrick [Member] | Dec. 31, 2012 St Patrick [Member] | Dec. 31, 2011 St Patrick [Member] | Dec. 31, 2010 St Patrick [Member] | Dec. 31, 2012 Kelanitissa [Member] | Dec. 31, 2011 Kelanitissa [Member] | Dec. 31, 2010 Kelanitissa [Member] | Dec. 31, 2012 Other Impairment [Member] | Dec. 31, 2011 Other Impairment [Member] | Dec. 31, 2010 Other Impairment [Member] | Dec. 31, 2012 Deepwater [Member] | Dec. 31, 2011 Deepwater [Member] MW | Dec. 31, 2010 Deepwater [Member] | Dec. 31, 2012 Southland Huntington Beach [Member] | Dec. 31, 2011 Southland Huntington Beach [Member] | Dec. 31, 2010 Southland Huntington Beach [Member]
Asset Impairment Expense [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges | $ 73 | $ 173 | $ 304 | $ 41 | $ 116 | $ 0 | $ 20 | $ 21 | $ 11 | $ 11 | $ 0 | $ 0 | $ 19 | $ 42 | $ 0 | $ 2 | $ 15 | $ 25 | $ 0 | $ 0 | $ 79 | $ 0 | $ 0 | $ 200
Fair Value of nonrecurring measurement | 35 |  |  |  |  |  | 25 | 0 | 22 |  |  |  | 10 |  |  |  |  |  |  |  |  |  | 88 |
Carrying Amount |  |  |  |  |  |  | $ 45 | $ 21 | $ 33 |  |  |  | $ 29 |  |  |  |  |  |  |  |  |  | $ 288 |
Generation Capacity (MW) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160 |  |  |  |

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- Details
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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 Total generation capacity of the subsidiary, in megawatts. + 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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