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Financial Statement Presentation (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Thames [Member]
Feb. 01, 2011
Thames [Member]
mw
Sep. 30, 2011
Brazil Depreciation Rates and Salvage Value [Member]
Sep. 30, 2011
Brazil Depreciation Rates and Salvage Value [Member]
Bankruptcy Proceedings [Line Items]      
Generation Capacity (MW)   208  
Assets$ 40,883$ 40,511 $ 158  
Liabilities   170  
Deconsolidation Gain Or Loss Amount Deferred  7   
Amount Paid To Satisfy Guarantee  5   
Change In Accounting Estimate [Line Items]      
Increase in depreciation expense from change in estimate    1752
Decrease in net income attributable to AES from change in estimate    $ 5$ 14
Per share impact of decrease in net income attributable to AES from change in estimate    $ 0.01$ 0.02