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Discontinued Operations And Held-For-Sale Businesses (Details) (USD $) | 3 Months Ended | 6 Months Ended |  | 7 Months Ended | 0 Months Ended |  | 0 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Sep. 30, 2013 Sonel [Member] | Sep. 30, 2013 Kribi [Member] | Sep. 30, 2013 Dibamba [Member] | Mar. 31, 2014 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 | Jun. 30, 2014 Cameroon [Member] business | Jun. 30, 2014 Cameroon [Member] business | Nov. 30, 2013 Armenia Mountain [Member] MW | Jun. 30, 2014 Noncurrent Asset [Member] Cameroon [Member]
Discontinued Operations Income Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 104,000,000 | $ 164,000,000 | [1] | $ 233,000,000 | $ 426,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Income from operations of discontinued businesses, before income tax | 15,000,000 | 4,000,000 | [1] | 49,000,000 | 6,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense | (8,000,000) | (7,000,000) | [1] | (22,000,000) | (5,000,000) |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations of discontinued businesses, after income tax | 7,000,000 | (3,000,000) | [1] | 27,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |
Number of Equity Interests Sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |
Equity Method Investment, Net Sales Proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | 202,000,000 |  |  | 40,000,000
Disposal Group, Including Discontinued Operation, Non-contingent Consideration, Fair Value, Amount to be Received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000
Letter of Credit Related to Sale Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 | 40,000,000 |  |
Net proceeds received from sale of businesses |  |  |  |  |  |  |  |  |  | 8,000,000 |  | 27,000,000 |  | 162,000,000 |  |  |
Impairment expenses |  |  |  | 273,000,000 | 48,000,000 |  |  |  | 101,000,000 |  |  |  |  |  |  |  |
Carrying amount |  |  |  |  |  |  |  |  | 435,000,000 |  |  |  |  |  |  |  |
Fair value less costs to sell |  |  |  |  |  |  |  |  | 334,000,000 |  |  |  |  |  |  |  |
Net (loss) income from disposal and impairments of discontinued businesses, after income tax | (13,000,000) | 3,000,000 | [1] | (56,000,000) | (33,000,000) |  |  |  |  |  |  |  |  |  | (7,000,000) |  |
Generation capacity mega watts |  |  |  |  |  |  |  |  |  |  | 39 |  | 234 |  |  | 101 |
Number of wind projects |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Buyer option to purchase ownership percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Buyer option to purchase ownership interest, sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |
Deferred proceeds from divestiture of businesses |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |
[1] | Includes the results of operations of our Ukraine utility businesses, which were sold in April 2013.

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