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Dispositions (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 3 Months Ended
Apr. 26, 2013
Feb. 09, 2012
MW
Mar. 31, 2013
Mar. 31, 2012
Pro Forma Information        
Electric Utility Revenue     $ 4,265 $ 4,586
Net Income Loss Attributable To The AES Corporation     82 341
Dispositions        
Cartagena ownership interest sold   80.00%    
Cartagena generation capacity (MW)   1,199    
Cartagena ownership interest prior to sale   70.81%    
Proceeds from sale of ownership interest in Cartagena 24 229    
Acquirer's option to purchase additional ownership interest in Cartagena   20.00%    
Price to exercise option to purchase remaining interest of Cartagena   36    
Gain on sale of Cartagena 20 178    
Deferred gain on sale of Cartagena   $ 9