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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 24 Months Ended 27 Months Ended 30 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jul. 09, 2012
Mar. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Stock Repurchase Plan [Abstract]                
Total repurchase amount authorized         $ 500 $ 680    
Acquisition of treasury stock (shares)     18,744,363       52,669,168  
Treasury Stock Value Acquired Cost Method Excluding Commissions     230       608  
Treasury Stock Acquired Average Cost Per Share     $ 12.31       $ 11.57  
Changes In Equity Disclosure [Line Items]                
Beginning Balance     9,729 10,413        
Net income 207 427 722 910        
Total change in fair value of available-for-sale securities, net of income tax 1 1 1 1        
Total foreign currency translation adjustment, net of income tax (385) 134 (244) 262        
Total pension adjustments, net of income tax 7 4 13 7        
Total change in fair value of derivatives, net of income tax (93) (81) 14 (10)        
Capital contributions from noncontrolling interests     12 3        
Distributions to noncontrolling interests     507 679        
Disposition of businesses     37 2        
Acquisition of treasury stock     231 98        
Issuance and exercise of stock-based compensation benefit plans, net of income tax     34 33        
Acquisition of subsidiary shares from noncontrolling interests     4 0        
Ending Balance 9,501   9,501       9,501  
Accumulated Other Comprehensive Loss                
Foreign currency translation adjustment 2,101   2,101       2,101 1,967
Unrealized derivative losses, net 511   511       511 534
Unfunded pension obligation 253   253       253 257
Accumulated other comprehensive loss 2,865   2,865       2,865 2,758
Net Income Attributable To Parent And Transfers To From Noncontrolling Interests [Abstract]                
Net income (loss) attributable to The AES Corporation 140 174 481 398        
The AES Corporation Stockholders' Equity
                
Changes In Equity Disclosure [Line Items]                
Beginning Balance     5,946 6,473        
Net income     481 398        
Total change in fair value of available-for-sale securities, net of income tax     0 (2)        
Total foreign currency translation adjustment, net of income tax     (134) 118        
Total pension adjustments, net of income tax     4 2        
Total change in fair value of derivatives, net of income tax     23 (13)        
Capital contributions from noncontrolling interests     0 0        
Distributions to noncontrolling interests     0 0        
Disposition of businesses     0 0        
Acquisition of treasury stock     231 98        
Issuance and exercise of stock-based compensation benefit plans, net of income tax     34 33        
Acquisition of subsidiary shares from noncontrolling interests     0 0        
Ending Balance 6,123 6,911 6,123 6,911     6,123  
Noncontrolling Interests
                
Changes In Equity Disclosure [Line Items]                
Beginning Balance     3,783 3,940        
Net income     241 512        
Total change in fair value of available-for-sale securities, net of income tax     0 0        
Total foreign currency translation adjustment, net of income tax     (110) 144        
Total pension adjustments, net of income tax     9 5        
Total change in fair value of derivatives, net of income tax     (9) 3        
Capital contributions from noncontrolling interests     12 3        
Distributions to noncontrolling interests     507 679        
Disposition of businesses     37 2        
Acquisition of treasury stock     0 0        
Issuance and exercise of stock-based compensation benefit plans, net of income tax     0 0        
Acquisition of subsidiary shares from noncontrolling interests     4 0        
Ending Balance $ 3,378 $ 3,926 $ 3,378 $ 3,926     $ 3,378