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Discontinued Operations (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 24, 2014 USD ($) | Jan. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Nov. 30, 2013 USD ($) project MW | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) business | Mar. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) business | Jun. 30, 2015 business | Oct. 30, 2013 MW | Sep. 30, 2013
Discontinued Operations Income Loss |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  | $ 0 |  |  | $ 233 |  |  |
Income from operations of discontinued businesses, before income tax |  |  |  |  |  | 0 |  |  | 49 |  |  |
Income tax expense |  |  |  |  | $ 0 | 0 |  | $ 0 | (22) |  |  |
Income from operations of discontinued businesses, after income tax |  |  |  |  | 0 | 0 |  | 0 | 27 |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of businesses classified as discontinued operations after adoption of new accounting standard | business |  |  |  |  |  |  |  |  |  | 0 |  |
Impairment expenses |  |  |  |  |  |  |  | 276 | 304 |  |  |
Net loss from disposal and impairments of discontinued businesses |  |  |  |  | 0 | 0 |  | 0 | (56) |  |  |
Sonel [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  | 56.00%
Kribi [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  | 56.00%
Dibamba [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  | 56.00%
Cameroon [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment expenses |  |  |  |  |  |  | $ 101 |  |  |  |  |
Carrying amount |  |  |  |  |  | 435 |  |  | 435 |  |  |
Fair value less costs to sell |  |  |  |  |  | $ 334 |  |  | $ 334 |  |  |
Saurashtra [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses | $ 8 |  |  |  |  |  |  |  |  |  |  |
Generation Capacity Mega Watts | MW |  |  |  |  |  |  |  |  |  |  | 39 |
US Wind Projects [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Divestiture Of Ownership In Subsidiary Percent |  |  |  | 100.00% |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 27 |  |  |  |  |  |  |  |  |  |
Generation Capacity Mega Watts | MW |  |  |  | 234 |  |  |  |  |  |  |  |
Number of wind projects | project |  |  |  | 3 |  |  |  |  |  |  |  |
Deferred proceeds from divestiture of businesses |  | $ 3 |  |  |  |  |  |  |  |  |  |
Cameroon [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of Equity Interests Sold | business |  |  |  |  |  | 3 |  |  | 3 |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  | $ 200 |  |  | $ 200 |  |  |
Proceeds from Divestiture of Businesses |  |  | $ 156 |  |  |  |  |  |  |  |  |
Letter of Credit Related to Sale Agreement |  |  |  |  |  | 40 |  |  | 40 |  |  |
Net loss from disposal and impairments of discontinued businesses |  |  |  |  |  | (7) |  |  |  |  |  |
Armenia Mountain [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Generation Capacity Mega Watts | MW |  |  |  | 101 |  |  |  |  |  |  |  |
Buyer option to purchase ownership percent |  |  |  | 100.00% |  |  |  |  |  |  |  |
Buyer option to purchase ownership interest, sales price |  |  |  | $ 75 |  |  |  |  |  |  |  |
Noncurrent Asset [Member] | Cameroon [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Non-contingent Consideration, Fair Value, Amount to be Received |  |  |  |  |  | $ 44 |  |  | $ 44 |  |  |
Carrying amount |  |  |  |  | $ 44 |  |  | $ 44 |  |  |  |

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