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Discontinued Operations and Held-For-Sale Businesses (Narrative) (Details) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended |
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Jan. 27, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jul. 01, 2015 USD ($) | Feb. 24, 2014 USD ($) | Jan. 30, 2014 USD ($) | Apr. 29, 2013 USD ($) business | Jun. 30, 2014 USD ($) | Nov. 30, 2013 USD ($) project | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Aug. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | $ 602,000,000 | $ 383,000,000 | $ 661,000,000 |
Net loss from disposal and impairments of discontinued operations |  |  |  |  |  |  |  |  |  |  | 0 | (56,000,000) | (152,000,000) |
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  |  | 306,000,000 | 789,000,000 | 284,000,000 |
Cameroon businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  | $ 101,000,000 |  |  |  |
Equity method investments (4) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |
U.S. wind projects |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 business |  |  |  |  | $ 27,000,000 |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  | $ 47,000,000 |  |  |  |  |  |
Fair value less costs to sell |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |
Number of wind projects | project |  |  |  |  |  |  |  | 3 |  |  |  |  |  |
Asset impairment charges attributable to noncontrolling interest |  |  |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |
Assets carrying amount |  |  |  |  |  |  |  | 77,000,000 |  |  |  |  |  |
Deferred proceeds from divestiture of business |  |  |  |  | $ 3,000,000 |  |  |  |  |  |  |  |  |
Poland wind projects |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  | 65,000,000 |  |  |  |  |  |
Net loss from disposal and impairments of discontinued operations |  |  |  |  |  |  |  | $ (2,000,000) |  |  |  |  |  |
Number of wind projects | project |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Kiev and Rivne |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  |  |  |  | $ 113,000,000 |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  | $ 38,000,000 |  |  |  |  |  |  |  |
Number of power distribution businesses sold | business |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Kiev |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture of ownership in subsidiary percent |  |  |  |  |  | 89.10% |  |  |  |  |  |  |  |
Rivne |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture of ownership in subsidiary percent |  |  |  |  |  | 84.60% |  |  |  |  |  |  |  |
Minimum | Poland wind projects |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture of ownership in subsidiary percent |  |  |  |  |  |  |  | 61.00% |  |  |  |  |  |
Maximum | Poland wind projects |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture of ownership in subsidiary percent |  |  |  |  |  |  |  | 89.00% |  |  |  |  |  |
Armenia Mountain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale agreement, buyer option to purchase ownership percent |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price |  |  |  |  |  |  |  | $ 75,000,000 |  |  |  |  |  |
Cameroon businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |
Proceeds from divestiture of business |  |  |  |  |  |  | 156,000,000 |  |  |  |  |  |  |
Net loss from disposal and impairments of discontinued operations |  |  |  |  |  |  |  |  | (7,000,000) |  |  |  |  |
Cameroon businesses | Noncurrent Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  | $ 44,000,000 |  | $ 44,000,000 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | DPLER |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  | $ 76,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  |  | 11,000,000 | (129,000,000) | 6,000,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Kelanitissa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture of ownership in subsidiary percent |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00%
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  |  | (7,000,000) | 1,000,000 | 16,000,000 |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Armenia Mountain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations Attributable to Parent |  |  |  |  |  |  |  |  |  |  | $ 6,000,000 | $ 7,000,000 | $ 4,000,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Armenia Mountain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  | $ 64,000,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Kelanitissa [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business | $ 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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