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Acquisitions and Dispositions (Details) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Feb. 09, 2012 USD ($) mw | Feb. 09, 2012 EUR (€) | Mar. 31, 2012 USD ($) | Mar. 31, 2011 USD ($) | Mar. 31, 2012 DPL Acquisition [Member] USD ($) | Dec. 31, 2011 DPL Acquisition [Member] | Dec. 31, 2011 Ohio Valley Electric Corporation [Member]
Acquisitions [Line Items] |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  | $ 3,500,000,000 |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 100.00% | 4.90%
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |
Electric Utility Revenue |  |  | 4,740,000,000 | 4,156,000,000 | 431,000,000 |  |
Net Income Loss Attributable To The AES Corporation |  |  | 341,000,000 | 224,000,000 | 22,000,000 |  |
Business Acquisition, Pro Forma Revenue |  |  | 4,740,000,000 | 4,623,000,000 |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  | 351,000,000 | 220,000,000 |  |  |
Business Acquisition Pro Forma Adjustments Net Of Tax Total |  |  | 10,000,000 | 48,000,000 |  |  |
Dispositions |  |  |  |  |  |  |
Cartagena ownership interest sold | 80.00% | 80.00% |  |  |  |  |
Cartagena generation capacity (MW) | 1,199 | 1,199 |  |  |  |  |
Cartagena ownership interest prior to sale | 70.81% | 70.81% |  |  |  |  |
Proceeds from sale of ownership interest in Cartagena | 229,000,000 | 172,000,000 |  |  |  |  |
Acquirer's option to purchase additional ownership interest in Cartagena | 20.00% | 20.00% |  |  |  |  |
Price to exercise option to purchase remaining interest of Cartagena | 37,000,000 | 28,000,000 |  |  |  |  |
Amount recovered by Cartagena from GDF | 95,000,000 | 71,000,000 |  |  |  |  |
Proceeds received on the settlement with GDF | 38,000,000 | 28,000,000 |  |  |  |  |
Gain on sale of Cartagena | 178,000,000 |  |  |  |  |  |
Deferred gain on sale of Cartagena | $ 9,000,000 |  |  |  |  |  |

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