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Discontinued Operations And Held For Sale Businesses (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Jun. 30, 2012 Red Oak [Member] | Mar. 31, 2012 Red Oak [Member] mw | Jun. 30, 2012 Ironwood [Member] | Mar. 31, 2012 Ironwood [Member] mw
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |
Generation Capacity (MW) |  |  |  | 832 |  | 710
Divestiture Of Ownership In Subsidiary Percent |  |  |  | 100.00% |  | 100.00%
Sale Proceeds |  |  | $ 147 |  | $ 87 |
Expected gain on sale (minimum) |  |  | 60 |  | 65 |
Expected gain on sale (maximum) |  |  | 70 |  | 75 |
Discontinued Operations Income Loss |  |  |  |  |  |
Revenue | 37 | 197 |  |  |  |
Income (loss) from operations of discontinued businesses | 3 | (10) |  |  |  |
Income tax (expense) benefit | (2) | 3 |  |  |  |
Income (loss) from operations of discontinued businesses | 1 | (7) |  |  |  |
Net gain/(loss) on sale and impairments of discontinued operations, net of tax | $ (5) | $ 0 |  |  |  |

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- Definition The maximum expected pretax gain (loss), not previously recognized and resulting from the sale of a business component, to be recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group. + References No definition available. + Details
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- Definition The minimum expected pretax gain (loss), not previously recognized and resulting from the sale of a business component, to be recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group. + 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 Gain (loss) after tax expense or benefit, not previously recognized and resulting from the sale of a business component, which is recognized at the date of sale. A gain (loss) reflects the amount by which the consideration received exceeds (is exceeded by) the net carrying amount (reflecting previous provisions for loss on disposal, if any) of the disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 -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 Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph b -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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