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Acquisitions and Dispositions (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  |
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Feb. 09, 2012 USD ($) MW | Feb. 09, 2012 EUR (€) | Sep. 30, 2012 USD ($) | Sep. 30, 2011 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2011 USD ($) | Sep. 30, 2012 Purchase Price Allocation Adjustments [Member] Property, plant and equipment [Member] USD ($) | Sep. 30, 2012 Purchase Price Allocation Adjustments [Member] Intangible assets subject to amortization [Member] USD ($) | Sep. 30, 2012 Purchase Price Allocation Adjustments [Member] Regulatory Assets [Member] USD ($) | Sep. 30, 2012 Purchase Price Allocation Adjustments [Member] Out of market coal contract [Member] USD ($) | Sep. 30, 2012 Purchase Price Allocation Adjustments [Member] Finalization of entity's standalone federal tax return [Member] USD ($) | Sep. 30, 2012 DPL Acquisition [Member] USD ($) | Sep. 30, 2011 DPL Acquisition [Member] USD ($) | Sep. 30, 2012 DPL Acquisition [Member] USD ($) | Sep. 30, 2011 DPL Acquisition [Member] USD ($) | Apr. 20, 2011 DPL Acquisition [Member] USD ($) | Sep. 30, 2012 DPL Acquisition [Member] Purchase Price Allocation Preliminary [Member] USD ($) | Sep. 30, 2012 DPL Acquisition [Member] Purchase Price Allocation Adjustments [Member] USD ($) | Sep. 30, 2012 DPL Acquisition [Member] Purchase Price Allocation Updated [Member] USD ($)
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500,000,000 |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Pro Forma Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Electric Utility Revenue |  |  | 4,587,000,000 | 4,307,000,000 | 13,519,000,000 | 12,898,000,000 |  |  |  |  |  | 472,000,000 |  | 1,288,000,000 |  |  |  |  |
Net Income Loss Attributable To The AES Corporation |  |  | (1,568,000,000) | (131,000,000) | (1,087,000,000) | 267,000,000 |  |  |  |  |  | (1,802,000,000) |  | (1,775,000,000) |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  |  |  | 4,820,000,000 |  | 14,309,000,000 |  |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  | (69,000,000) |  | 336,000,000 |  |  |  |
Business Acquisition Pro Forma Adjustments Net Of Tax Total |  |  |  | (5,000,000) |  | 73,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price Allocation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 116,000,000 | 0 | 116,000,000
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 278,000,000 | 0 | 278,000,000
Inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 124,000,000 | 0 | 124,000,000
Other current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,000,000 | 0 | 41,000,000
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,549,000,000 | (71,000,000) | 2,478,000,000
Intangible assets subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166,000,000 | (19,000,000) | 147,000,000
Intangible assets - indefinite-lived |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 0 | 5,000,000
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 201,000,000 | 16,000,000 | 217,000,000
Other noncurrent assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,000,000 | 0 | 58,000,000
Current liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (401,000,000) | (5,000,000) | (406,000,000)
Non-recourse debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,255,000,000) | 0 | (1,255,000,000)
Deferred taxes |  |  |  |  |  |  | 25,000,000 | 7,000,000 | (21,000,000) | 12,000,000 | (16,000,000) |  |  |  |  |  | (558,000,000) | 7,000,000 | (551,000,000)
Regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (117,000,000) | 0 | (117,000,000)
Other noncurrent liabilities |  |  |  |  |  |  |  |  |  | (29,000,000) | 13,000,000 |  |  |  |  |  | (195,000,000) | (15,000,000) | (210,000,000)
Redeemable preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,000,000) | 0 | (18,000,000)
Net identifiable assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 994,000,000 | (87,000,000) | 907,000,000
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,489,000,000 | 87,000,000 | 2,576,000,000
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,483,000,000 | 0 | 3,483,000,000
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of St. Patrick and InnoVent |  |  | 42,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of China equity method investments |  |  | 86,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of China equity method investments |  |  | $ 178,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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