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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 |  |

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