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Discontinued Operations and Held-For-Sale Businesses (Narrative) (Details) (USD $) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 0 Months Ended |  | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |  | 0 Months Ended | 1 Months Ended
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Dec. 31, 2013 MW | Dec. 31, 2012 | Dec. 31, 2011 | Nov. 30, 2013 Poland wind projects project | Nov. 30, 2013 US Wind Projects project MW | Sep. 30, 2013 Saurashtra | Oct. 30, 2013 Saurashtra MW | Sep. 30, 2013 Cameroon | Sep. 30, 2013 Sonel | Sep. 30, 2013 Kribi | Sep. 30, 2013 Dibamba | Apr. 29, 2013 Kiev and Rivne business | Apr. 29, 2013 Kiev customer | Apr. 29, 2013 Rivne customer | Dec. 31, 2012 Tisza I I Subsidiary MW | Dec. 31, 2011 Tisza I I Subsidiary | Dec. 31, 2010 Tisza I I Subsidiary | Apr. 30, 2012 Red Oak and Ironwood | Apr. 30, 2012 Red Oak MW | Apr. 30, 2012 Ironwood MW | Nov. 30, 2011 Argentina Distribution MW | Nov. 30, 2011 Edelap customer | Nov. 30, 2011 Edes customer | Nov. 30, 2011 Edelap and Edes business | Nov. 30, 2011 Central Dique | Oct. 31, 2011 Brazil Telecom business | Dec. 31, 2011 Carbon Reduction Projects | Dec. 31, 2011 Wind Projects | Dec. 31, 2012 Eastern Energy Subsidiary | Dec. 31, 2010 Eastern Energy Subsidiary | Mar. 31, 2011 Eastern Energy Subsidiary MW plant | Nov. 30, 2011 Borsod plant MW | Dec. 31, 2011 Thames MW | Nov. 30, 2013 Minimum Poland wind projects | Nov. 30, 2013 Maximum Poland wind projects | Jan. 30, 2014 Subsequent Event US Wind Projects | Feb. 24, 2014 Subsequent Event Saurashtra | Nov. 30, 2013 Armenia Mountain MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Divestiture of ownership in subsidiary percent |  |  |  |  | 100.00% |  |  |  | 56.00% | 56.00% | 56.00% |  | 89.10% | 84.60% | 100.00% |  |  | 100.00% |  |  |  |  |  | 90.00% | 51.00% | 46.00% | 100.00% |  |  |  |  |  |  | 61.00% | 89.00% |  |  |
Number of wind projects |  |  |  | 10 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from divestiture of business |  |  |  | $ 7,000,000 |  |  |  |  |  |  |  | $ 113,000,000 |  |  | $ 14,000,000 |  |  | $ 228,000,000 |  |  | $ 4,000,000 |  |  |  |  | $ 893,000,000 |  |  |  |  |  |  |  |  |  | $ 27,000,000 | $ 8,000,000 |
Net gain (loss) from disposal and impairments of discontinued businesses, after income tax | (152,000,000) | 16,000,000 | 86,000,000 | (2,000,000) |  |  |  |  |  |  |  |  |  |  | (87,000,000) |  |  | 73,000,000 |  |  | (338,000,000) |  |  |  |  | 446,000,000 |  | (22,000,000) | 30,000,000 |  |  |  |  |  |  |  |  |
Asset impairment expense | 661,000,000 | 1,940,000,000 | 366,000,000 | 65,000,000 | 47,000,000 | 12,000,000 |  | 63,000,000 |  |  |  | 38,000,000 |  |  |  | 52,000,000 | 85,000,000 |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  | 827,000,000 |  |  |  |  |  |  |  |
Production Capacity (MW) | 2,465 |  |  |  | 234 |  | 39 |  |  |  |  |  |  |  | 900 |  |  |  | 832 | 710 | 68 |  |  |  |  |  |  |  |  |  | 1,169 | 161 | 208 |  |  |  |  | 101
Sale agreement, buyer option to purchase ownership percent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Sale agreement, buyer option to purchase ownership interest, sales price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000
Asset impairment charges attributable to noncontrolling interest |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets carrying amount |  |  |  |  | 77,000,000 | 19,000,000 |  | 414,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value less costs to sell |  |  |  |  | 30,000,000 | 7,000,000 |  | 351,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred proceeds from divestiture of business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Number of power distribution businesses sold |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers served |  |  |  |  |  |  |  |  |  |  |  |  | 881,000 | 412,000 |  |  |  |  |  |  |  | 329,000 | 172,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of discontinued operation from cumulative translation losses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,000,000 |  |  |  |  |  | 208,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of telecommunication businesses sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Assets, fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |
Number of power plants held for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Number of power plants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |

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