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Discontinued Operations And Held-For-Sale Businesses (Details) (USD $) | 3 Months Ended |  | 7 Months Ended |  | 0 Months Ended |  | 0 Months Ended |  | 1 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013 | Sep. 30, 2013 Sonel [Member] | Sep. 30, 2013 Kribi [Member] | Sep. 30, 2013 Dibamba [Member] | Mar. 31, 2014 Cameroon [Member] | Sep. 30, 2013 Cameroon [Member] | Feb. 24, 2014 Saurashtra [Member] | Oct. 30, 2013 Saurashtra [Member] MW | Jan. 30, 2014 US Wind Projects [Member] | Nov. 30, 2013 US Wind Projects [Member] project MW | Nov. 30, 2013 Armenia Mountain [Member] MW
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of ownership in subsidiary percent |  |  |  | 56.00% | 56.00% | 56.00% |  |  |  |  |  | 100.00% |
Asset impairment charges | $ 166,000,000 | $ 48,000,000 |  |  |  |  | $ 101,000,000 |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  | 435,000,000 |  |  |  |  |
Fair value less costs to sell |  |  |  |  |  |  |  | 334,000,000 |  |  |  |  |
Generation capacity mega watts |  |  |  |  |  |  |  |  |  | 39 |  | 234 | 101
Net proceeds received from sale of businesses |  |  |  |  |  |  |  |  | 8,000,000 |  | 27,000,000 |  |
Number of wind projects |  |  |  |  |  |  |  |  |  |  |  | 3 |
Buyer option to purchase ownership interest, sales price |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000
Buyer option to purchase ownership percent |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Deferred proceeds from divestiture of businesses |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Discontinued Operations Income Loss |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 129,000,000 | 262,000,000 | [1] |  |  |  |  |  |  |  |  |  |
Income from operations of discontinued businesses, before income tax | 34,000,000 | 2,000,000 | [1] |  |  |  |  |  |  |  |  |  |
Income tax benefit (expense) | (14,000,000) | 2,000,000 | [1] |  |  |  |  |  |  |  |  |  |
Income from operations of discontinued businesses, after income tax | 20,000,000 | 4,000,000 | [1] |  |  |  |  |  |  |  |  |  |
Net loss from disposal and impairments of discontinued businesses, after income tax | $ (43,000,000) | $ (36,000,000) | [1] |  |  |  |  |  |  |  |  |  |
[1] | Includes the results of operations of our Ukraine utility businesses, which were sold in April 2013.

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