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Segments and Geographic Information Segment and Geographic Information (Revenue and Assets by Country) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | $ 15,891 |  | $ 17,164 |  | $ 16,098 |
Property, plant and equipment, net | 25,112 |  | 24,635 |  |  |
Discontinued Operations |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Assets held for sale |  |  | 25 |  |  |
United States |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 3,630 | [1] | 3,736 | [1] | 2,088 | [1]
Property, plant and equipment, net | 7,523 | [1] | 7,540 | [1] |  |
United States | Discontinued Operations |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 23 |  | 63 |  | 396 |
Property, plant and equipment, net | 69 |  | 123 |  |  |
Brazil |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 5,015 | [2] | 5,788 | [2] | 6,640 | [2]
Property, plant and equipment, net | 5,293 | [2] | 5,756 | [2] |  |
Brazil | Discontinued Operations |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue |  |  |  |  | 124 |
Chile |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 1,569 |  | 1,679 |  | 1,608 |
Property, plant and equipment, net | 3,312 |  | 2,993 |  |  |
El Salvador |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 860 |  | 854 |  | 755 |
Property, plant and equipment, net | 292 |  | 284 |  |  |
Dominican Republic |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 832 |  | 761 |  | 674 |
Property, plant and equipment, net | 689 |  | 670 |  |  |
United Kingdom |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 558 |  | 505 |  | 587 |
Property, plant and equipment, net | 603 |  | 578 |  |  |
Argentina |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 545 | [3] | 857 | [3] | 979 | [3]
Property, plant and equipment, net | 256 | [3] | 278 | [3] |  |
Argentina | Discontinued Operations |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue |  |  |  |  | 102 |
Colombia |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 523 |  | 453 |  | 365 |
Property, plant and equipment, net | 412 |  | 383 |  |  |
Philippines |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 497 |  | 559 |  | 480 |
Property, plant and equipment, net | 776 |  | 800 |  |  |
Mexico |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 440 |  | 397 |  | 404 |
Property, plant and equipment, net | 748 |  | 759 |  |  |
Bulgaria |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 422 | [4] | 369 | [4] | 251 | [4]
Property, plant and equipment, net | 1,606 | [4] | 1,606 | [4] |  |
Puerto Rico |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 328 |  | 293 |  | 298 |
Property, plant and equipment, net | 562 |  | 570 |  |  |
Panama |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 250 |  | 266 |  | 189 |
Property, plant and equipment, net | 1,028 |  | 1,069 |  |  |
Kazakhstan |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 156 |  | 151 |  | 145 |
Property, plant and equipment, net | 183 |  | 141 |  |  |
Jordan |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 142 |  | 121 |  | 124 |
Property, plant and equipment, net | 439 |  | 222 |  |  |
Sri Lanka |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 53 |  | 169 |  | 140 |
Property, plant and equipment, net | 7 |  | 8 |  |  |
Spain |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 0 |  | 119 |  | 258 |
Property, plant and equipment, net | 0 |  | 0 |  |  |
Cameroon |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 0 | [5] | 0 | [5] | 0 | [5]
Property, plant and equipment, net | 0 | [5] | 0 | [5] |  |
Cameroon | Discontinued Operations |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 474 |  | 457 |  | 386 |
Property, plant and equipment, net | 1,100 |  | 992 |  |  |
Ukraine |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 0 | [6] | 0 | [6] | 0 | [6]
Property, plant and equipment, net | 0 | [6] | 0 | [6] |  |
Ukraine | Discontinued Operations |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 187 |  | 491 |  | 418 |
Property, plant and equipment, net |  |  | 112 |  |  |
Hungary |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 0 | [7] | 0 | [7] | 0 | [7]
Property, plant and equipment, net | 0 | [7] | 0 | [7] |  |
Hungary | Discontinued Operations |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue |  |  | 18 |  | 219 |
Vietnam |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 0 |  | 0 |  | 0 |
Property, plant and equipment, net | 1,296 |  | 887 |  |  |
Other Non Us |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 71 | [8] | 87 | [8] | 113 | [8]
Property, plant and equipment, net | 87 | [8] | 91 | [8] |  |
Other Non Us | Discontinued Operations |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 6 |  | 11 |  | 18 |
Property, plant and equipment, net | 19 |  | 54 |  |  |
Total Non Us |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |
Revenue | 12,261 |  | 13,428 |  | 14,010 |
Property, plant and equipment, net | $ 17,589 |  | $ 17,095 |  |  |
[1] | Excludes revenue of $23 million, $63 million and $396 million for the years ended December 31, 2013, 2012 and 2011, respectively, and property, plant and equipment of $69 million and $123 million as of December 31, 2013 and 2012, respectively, related to Condon, Mid-West Wind, Eastern Energy, Thames, Red Oak and Ironwood which were reflected as discontinued operations and assets held for sale in the accompanying Consolidated Statements of Operations and Consolidated Balance Sheets. Additionally, property, plant and equipment excludes $25 million as of December 31, 2012 related to wind turbines which were reflected as assets held for sale in the accompanying Consolidated Balance Sheets.
[2] | Excludes revenue of $124 million for the year ended December 31, 2011 related to Brazil Telecom, which was reflected as discontinued operations in the accompanying Consolidated Statements of Operations.
[3] | Excludes revenue of $102 million for the year ended December 31, 2011 related to our Argentina distribution businesses, which were reflected as discontinued operations in the accompanying Consolidated Statements of Operations.
[4] | Our wind project in Maritza started operations in June 2011.
[5] | Excludes revenue of $474 million, $457 million and $386 million for the years ended December 31, 2013, 2012 and 2011, respectively, and property, plant and equipment of $1,100 million and $992 million as of December 31, 2013 and 2012 respectively, related to Dibamba, Kribi and Sonel, which were reflected as discontinued operations and assets held for sale in the accompanying Consolidated Statements of Operations and Consolidated Balance Sheets.
[6] | Excludes revenue of $187 million, $491 million and $418 million for the years ended December 31, 2013, 2012 and 2011, respectively, and property, plant and equipment of $112 million as of December 31, 2012 related to Kievoblenergo and Rivnooblenergo, which were reflected as discontinued operations and assets held for sale in the accompanying Consolidated Statements of Operations and Consolidated Balance Sheets.
[7] | Excludes revenue of $18 million and $219 million for the years ended December 31, 2012 and 2011, respectively, related to Borsod, Tiszapalkonya and Tisza II, which were reflected as discontinued operations and assets held for sale in the accompanying Consolidated Statements of Operations.
[8] | Excludes revenue of $6 million, $11 million and $18 million for the years ended December 31, 2013, 2012 and 2011, respectively, and property, plant and equipment of $19 million and $54 million as of December 31, 2013 and 2012, respectively, related to Saurashtra, Poland wind and our carbon reduction projects, which were reflected as discontinued operations and assets held for sale in the accompanying Consolidated Statements of Operations and Consolidated Balance Sheets.

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