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Acquisitions and Dispositions (Details) (USD $)
 0 Months Ended 3 Months Ended 5 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Jul. 10, 2013
Trinidad Generation Unlimited
Apr. 26, 2013
AES Cartagena
MW
Jun. 30, 2013
AES Cartagena
Jul. 31, 2013
AES Cartagena
Dec. 31, 2012
AES Cartagena
Jun. 30, 2012
InnoVent and St. Patrick
Dec. 31, 2012
China Wind
Dec. 31, 2011
DPL Acquisition
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]                
Percentage of voting interest acquired               100.00%
Business acquisition purchase price               $ 3,500,000,000
Dispositions                
Equity method investment, ownership percentage sold 10.00%              
Proceeds from the sale of equity method investments 31,000,000              
Equity method investment 28,000,000              
Equity method investment, gain (loss) on disposal 3,000,000              
Cartagena generation capacity (MW)   1,199            
Proceeds from sale of ownership interest in Cartagena   24,000,000            
Pre-tax gain on disposal     20,000,000   178,000,000      
Cartagena ownership interest sold         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      
Proceeds from the sale of interest in affiliate           42,000,000    
Proceeds from sale of China equity method investments             133,000,000  
Gain on sale of China equity method investments             $ 27,000,000