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Discontinued Operations and Held for sale businesses (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 30, 2014 USD ($) | Nov. 30, 2013 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Nov. 01, 2013 integer
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Cash Provided by (Used in) Operating Activities, Discontinued Operations |  |  |  |  |  | $ 57 | $ (47) |  |
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax |  |  |  | $ (382) | $ 0 | (382) | 0 |  |
disposal group, not discontinued operations, available for purchase at option of acquirer |  | $ 3 |  |  |  |  |  |  |
Proceeds from sale of ownership interest |  |  |  |  |  | (134) | (461) |  |
Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal |  |  |  |  |  | 266 |  |  |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  |  |  | 0 |  | 0 |  | $ 882 |
Expected future loss on disposal |  |  |  | 700 |  |  |  |  |
Expected Cumulative impact of sale |  |  |  | 1,100 |  |  |  |  |
Expected amounts of CTA to be reclassed as a result of sale |  |  |  | 1,000 |  | 1,000 |  |  |
Expected reduction in Stockholders equity as a result of sale |  |  |  | 100 |  | 100 |  |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  | (1) | (3) | (3) | (7) |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  | (379) | (10) | (388) | (17) |  |
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  |  |  |  |  | (84) | 7 |  |
US Wind Projects [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  | 100.00%
Number of U.K. Wind Projects Sold | integer |  |  |  |  |  |  |  |  | 3
Proceeds from sale of ownership interest |  | $ 27 |  |  |  |  |  |  |
Armenia Mountain [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price |  |  | $ 75 |  |  |  |  |  |
Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents |  |  |  | 5 |  | 5 |  | 5 |
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets |  |  |  | 78 |  | 78 |  | 15 |
Disposal Group, Including Discontinued Operation, Revenue |  |  |  | 219 | 202 | 419 | 428 |  |
Disposal Group, Including Discontinued Operation, Costs of Goods Sold |  |  |  | (204) | (203) | (408) | (428) |  |
Impairment Expense Pre Tax Total |  |  |  | (783) | 0 | (783) | 0 |  |
Disposal Group, Including Discontinued Operation, Other Expense |  |  |  | (11) | (12) | (20) | (24) |  |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  |  |  | 1,600 |  | 1,600 |  |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  | (779) | (13) | (792) | (24) |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  | 400 | 3 | 404 | 7 |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  | (379) | $ (10) | (388) | $ (17) |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  |  |  | 183 |  | 183 |  | 171 |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  |  |  | 837 |  | 837 |  | 668 |
Disposal Group, Including Discontinued Operation, Deferred Tax Assets |  |  |  | 594 |  | 594 |  | 133 |
Disposal Group, Including Discontinued Operation, Other Assets |  |  |  | 188 |  | 188 |  | 218 |
Disposal group, loss recognized on classification as held for sale | [1] |  |  | (837) |  | (837) |  | 0 |
Disposal Group, Including Discontinued Operation, Assets | [2] |  |  | 1,048 |  | 1,048 |  | 1,306 |
Disposal Group, Including Discontinued Operation, Accounts Payable |  |  |  | 133 |  | 133 |  | 150 |
Disposal group, including discontinued operations, accrued interest |  |  |  | 20 |  | 20 |  | 15 |
Disposal Group, Including Discontinued Operation, Accrued Liabilities |  |  |  | 151 |  | 151 |  | 150 |
Non Recourse Debt Held For Sale Or Discontinued Operations |  |  |  | 373 |  | 373 |  | 346 |
Disposal Group, Including Discontinued Operation, Other Liabilities |  |  |  | 164 |  | 164 |  | 110 |
Disposal Group, Including Discontinued Operation, Liabilities | [2] |  |  | 841 |  | 841 |  | 784 |
Sul Subsidiary [Member] | Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets |  |  |  | 1,048 |  | 1,048 |  | 1,210 |
Disposal Group, Including Discontinued Operation, Liabilities |  |  |  | 841 |  | 841 |  | 771 |
Sul Subsidiary [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Assets | [3] |  |  | 0 |  | 0 |  | 96 |
Disposal Group, Including Discontinued Operation, Liabilities | [3] |  |  | 0 |  | 0 |  | $ 13 |
Armenia Mountain [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  | 100.00%
Pre-tax income of disposed businesses, Excluding gain on disposal, included in continuing operations |  |  |  | $ 2 |  | 6 |  |  |
Sul Subsidiary [Member] |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |
Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal |  |  |  |  |  | $ 135 |  |  |
[1] | (3) Pre-tax impairment expense of $783 million is net of the impact from cumulative translation adjustments.
[2] | (1) Amounts at December 31, 2015 are classified as both current and long-term on the Condensed Consolidated Balance Sheet.
[3] | (2) DPLER and Kelanitissa classified as held-for-sale at December 31, 2015. See Note 16—Dispositions for further information.

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