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Discontinued Operations And Held For Sale Businesses (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Gain (loss) on disposal and impairment, after taxes $ 86 $ 64 $ (150)
(Gain) loss on disposal and impairment write-down before tax and NCI 388 209 (150)
Tax effect of gain on disposal of discontinued oeprations 300 132 0
Asset impairment expense 225 389 20
Discontinued Operations Income Loss      
Revenue 485 1,310 1,579
Income (loss) from operations of discontinued businesses, before taxes (124) (745) 146
Income tax (expense) benefit 27 270 (45)
Income (loss) from operations of discontinued businesses (97) (475) 101
Subsidiary Lal Pir And Pak Gen [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Sale Proceeds   117  
Sale Proceeds AES Portion   65  
Gain (loss) on disposal and impairment, after taxes   (22) (150)
Loss on disposal and impairment recognized net of tax and noncontrolling interests   14  
Subsidiary Lal Pir [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Generation Capacity (MW)   362  
Divestiture Of Ownership In Subsidiary Percent   55.00%  
Gain (loss) on disposal and impairment, after taxes 0 (6) (74)
Subsidiary Pak Gen [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Generation Capacity (MW)   365  
Divestiture Of Ownership In Subsidiary Percent   55.00%  
Gain (loss) on disposal and impairment, after taxes 0 (16) (76)
Subsidiary Barka [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Generation Capacity (MW)   456  
Divestiture Of Ownership In Subsidiary Percent   35.00%  
Sale Proceeds   170  
Sale Proceeds AES Portion   124  
Gain (loss) on disposal and impairment, after taxes 0 80 0
Subsidiary Ras Laffan [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Generation Capacity (MW)   756  
Divestiture Of Ownership In Subsidiary Percent   55.00%  
Sale Proceeds   234  
Gain (loss) on disposal and impairment, after taxes 0 6 0
Eastern Energy Subsidiary [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Generation Capacity (MW) 1,169    
Asset impairment expense 827    
Subsidiary Borsod And Tiszapalkonya [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Generation Capacity (MW) 161    
Brazil Telecom [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Divestiture Of Ownership In Subsidiary Percent 46.00%    
Sale Proceeds 893    
Gain (loss) on disposal and impairment, after taxes 446 0 0
Edelap Edes And Central Dique [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Sale Proceeds 4    
Gain (loss) on disposal and impairment, after taxes (338) 0 0
Loss recognized due to CTA 208    
Edelap [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Divestiture Of Ownership In Subsidiary Percent 90.00%    
Customers Served 329,000    
Edes [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Divestiture Of Ownership In Subsidiary Percent 90.00%    
Customers Served 172,000    
Central Dique [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Generation Capacity (MW) 68    
Divestiture Of Ownership In Subsidiary Percent 51.00%    
Carbon Reduction Projects [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Divestiture Of Ownership In Subsidiary Percent 100.00%    
Asset impairment expense 40    
Fair Value 0    
Carrying Amount 49    
Wind Projects [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Gain (loss) on disposal and impairment, after taxes $ (22) $ 0 $ 0
Thames [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Generation Capacity (MW) 208    
Subsidiary Barka Service Companies [Member]
      
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]      
Divestiture Of Ownership In Subsidiary Percent   100.00%