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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
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.