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Dispositions (Details) (AES Cartagena [Member], USD $)
In Millions, unless otherwise specified
0 Months Ended 1 Months Ended 3 Months Ended 5 Months Ended 12 Months Ended
Apr. 26, 2013
MW
Feb. 29, 2012
Jun. 30, 2013
Jul. 31, 2013
Dec. 31, 2012
AES Cartagena [Member]
         
Dispositions          
Cartagena generation capacity (MW) 1,199        
Proceeds from sale of ownership interest in Cartagena $ 24        
Pre-tax gain on disposal     $ 20   $ 178
Cartagena ownership interest sold   80.00%     80.00%
Cartagena ownership interest prior to sale         70.81%
Acquirer's option to purchase additional ownership interest in Cartagena         20.00%
Term of buyer option to purchase Company's remaining interest       5 months  
Company's continuing ownership interest extension period (beyond one year)   1 year