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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2012
Table Text Block  
Equity Ownership Interest And Carrying Values Of Investments Accounted For Under The Equity Method
    December 31,
Affiliate Country 2012 2011 2012 2011
             
    Carrying Value Ownership Interest %
    (in millions)    
AES Solar Holding Co(1) Various $ 307 $ 324 50% 50%
Barry(2) United Kingdom   -   - 100% 100%
Cartagena(3) Spain   -  N/A 14% N/A
CET(2) Brazil   13   14 72% 72%
Chigen affiliates (4) China   2   30 35% 25%
China Wind(5) China   -   75 0% 49%
Elsta  Netherlands   219   197 50% 50%
Entek(6) Turkey   234   121 50% 50%
Guacolda  Chile   196   186 35% 35%
IC Ictas Energy Group(6) Turkey   -   161 0% 51%
InnoVent(2),(7) France   -   32 0% 40%
JHRH(8) China   -   59 0% 49%
OPGC  India   199   203 49% 49%
Trinidad Generation Unlimited(2) Trinidad   24   19 10% 10%
Other affiliates Various   2   1    
Total investments in and advances to affiliates $ 1,196 $ 1,422    
Investments In and Advances to Affiliates Financial Information
  50%-or-less Owned Affiliates Majority-Owned Unconsolidated Subsidiaries
                   
Years ended December 31, 2012 2011 2010 2012 2011 2010
                   
  (in millions) (in millions)
Revenue $ 1,868 $ 1,668 $ 1,341 $ 106 $ 24 $ 20
Gross margin   355   258   207   26   24   18
Net income (loss)   146   (5)   100   (5)   (5)   7
                   
December 31, 2012 2011    2012 2011   
                   
  (in millions)    (in millions)   
Current assets $ 1,097 $ 1,182    $ 2 $ 58   
Noncurrent assets   5,253   4,298      38   519   
Current liabilities   680   899      55   109   
Noncurrent liabilities   2,899   1,720      20   269   
Noncontrolling interests   (228)   (240)      -   -   
Stockholders' equity   2,999   3,101      (35)   199   
Goodwill By Segments
                      
    US -  US -  Andes - MCAC - EMEA - Asia -  Corporate   
    Generation Utilities Generation Generation Generation Generation and Other Total
                           
Balance as of December 31, 2010                        
 Goodwill $ 106 $ - $ 899 $ 16 $ 180 $ 80 $ 133 $ 1,414
 Accumulated impairment losses   (21)   -   -   -   (122)   -   -   (143)
  Net balance   85   -   899   16   58   80   133   1,271
                           
 Impairment losses   -   -   -   -   -   (17)   -   (17)
 Goodwill acquired during the year   -   2,576   -   -   -   -   -   2,576
 Foreign currency translation                        
  and other   (10)   -   -   -   -   -   -   (10)
                           
Balance as of December 31, 2011                        
 Goodwill   96   2,576   899   16   180   80   133   3,980
 Accumulated impairment losses   (21)   -   -   -   (122)   (17)   -   (160)
  Net balance   75   2,576   899   16   58   63   133   3,820
                           
 Impairment losses   -   (1,817)   -   -   -   -   -   (1,817)
 Goodwill associated with the                         
  sale of a business   -   -   -   -   -   -(1)   -   -
 Foreign currency translation                        
  and other   (9)   -   -   -   -   5   -   (4)
                           
Balance as of December 31, 2012                        
 Goodwill   87   2,576   899   16   180   68   133   3,959
 Accumulated impairment losses   (21)   (1,817)   -   -   (122)   -   -   (1,960)
  Net balance $ 66 $ 759 $ 899 $ 16 $ 58 $ 68 $ 133 $ 1,999
Other Intangible Assets
   December 31, 2012 December 31, 2011
   Gross Accumulated Net Gross Accumulated Net
   Balance Amortization  Balance Balance Amortization  Balance
                    
    (in millions) (in millions)
Subject to Amortization                  
Project development rights(1) $ 102 $ (1) $ 101 $ 109 $ (1) $ 108
Sales concessions   194   (101)   93   199   (95)   104
Contractual payment rights(2)   72   (23)   49   69   (13)   56
Management rights   40   (14)   26   39   (13)   26
Emission allowances   4   -   4   14   -   14
Electric security plan   87   (87)   -   87   (9)   78
Contracts   44   (20)   24   44   (17)   27
Customer contracts and relationships   66   (26)   40   66   (7)   59
Other(3)   15   (4)   11   18   (9)   9
 Subtotal   624   (276)   348   645   (164)   481
Indefinite-Lived Intangible Assets                  
Land use rights   50   -   50   52   -   52
Water rights   18   -   18   5   -   5
Trademark/Trade name   6   -   6   5   -   5
Other   7   -   7   2   -   2
 Subtotal   81   -   81   64   -   64
Total $ 705 $ (276) $ 429 $ 709 $ (164) $ 545
Schedule Of Acquired Intangible Assets By Major Class [Text Block]
   December 31, 2012
     Subject to     
      Amortization/ Weighted Average Amortization
   Amount Indefinite-Lived Amortization Period Method
             
   (in millions)   (in years)   
Renewable energy certificates $ 5 Subject to amortization  Various  As utilized
Water rights   13 Indefinite-lived  N/A  N/A
Other    1 Indefinite-lived  N/A  N/A
Total $ 19        
             
   December 31, 2011
     Subject to     
      Amortization/ Weighted Average Amortization
   Amount Indefinite-Lived Amortization Period Method
             
   (in millions)   (in years)   
Electric security plan(1) (2) $ 87 Subject to amortization   1  Straight line
Customer relationships(1) (3)   32 Subject to amortization   12  Other
Customer contracts(1) (4)   28 Subject to amortization   3  Other
Trademark/Trade name(1) (5)   5 Indefinite-lived  N/A  N/A
Other   4 Subject to amortization  Various  As utilized
Total $ 156        
Schedule of Expected Amortization Expense [Table Text Block]
   Estimated amortization expense
   2013 2014 2015 2016 2017
                 
    (in millions)
 Customer relationships & contracts $ 11 $ 5 $ 4 $ 3 $ 3
 Sales concessions   8   8   8   8   8
 Contractual payment rights   9   9   9   3   3
 All other   4   3   3   3   2
 Total $ 32 $ 25 $ 24 $ 17 $ 16