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Acquisitions and Dispositions (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Feb. 09, 2012 USD ($) mw | Feb. 09, 2012 EUR (€) | Jun. 30, 2012 USD ($) | Jun. 30, 2011 USD ($) | Jun. 30, 2012 USD ($) | Jun. 30, 2011 USD ($) | Jun. 30, 2012 DPL Acquisition [Member] USD ($) | Jun. 30, 2011 DPL Acquisition [Member] USD ($) | Jun. 30, 2012 DPL Acquisition [Member] USD ($) | Jun. 30, 2011 DPL Acquisition [Member] USD ($) | Apr. 20, 2011 DPL Acquisition [Member] USD ($) | Jun. 30, 2012 DPL Acquisition [Member] Preliminary USD ($) | Jun. 30, 2012 DPL Acquisition [Member] Revisions USD ($) | Jun. 30, 2012 DPL Acquisition [Member] Updated 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 |  |  | 4,192,000,000 | 4,435,000,000 | 8,932,000,000 | 8,591,000,000 | 385,000,000 |  | 816,000,000 |  |  |  |  |
Net Income Loss Attributable To The AES Corporation |  |  | 140,000,000 | 174,000,000 | 481,000,000 | 398,000,000 | 5,000,000 |  | 27,000,000 |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  |  |  | 4,866,000,000 |  | 9,489,000,000 |  |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  |  |  | 186,000,000 |  | 406,000,000 |  |  |  |
Business Acquisition Pro Forma Adjustments Net Of Tax Total |  |  |  | (20,000,000) |  | (68,000,000) |  |  |  |  |  |  |  |
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 | (1,000,000) | 40,000,000
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  | 2,549,000,000 | (114,000,000) | 2,435,000,000
Intangible assets subject to amortization |  |  |  |  |  |  |  |  |  |  |  | 166,000,000 | 4,000,000 | 170,000,000
Intangible assets - indefinite-lived |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 0 | 5,000,000
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  | 201,000,000 | 1,000,000 | 202,000,000
Other noncurrent assets |  |  |  |  |  |  |  |  |  |  |  | 58,000,000 | 0 | 58,000,000
Current liabilities |  |  |  |  |  |  |  |  |  |  |  | (401,000,000) | 0 | (401,000,000)
Non-recourse debt |  |  |  |  |  |  |  |  |  |  |  | (1,255,000,000) | 0 | (1,255,000,000)
Deferred taxes |  |  |  |  |  |  |  |  |  |  |  | (558,000,000) | 39,000,000 | (519,000,000)
Regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  | (117,000,000) | 1,000,000 | (116,000,000)
Other noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  | (195,000,000) | 0 | (195,000,000)
Redeemable preferred stock |  |  |  |  |  |  |  |  |  |  |  | (18,000,000) | 0 | (18,000,000)
Net identifiable assets acquired |  |  |  |  |  |  |  |  |  |  |  | 994,000,000 | (70,000,000) | 924,000,000
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 2,489,000,000 | 70,000,000 | 2,559,000,000
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 |  |  |  |  |  |  |  |  |  |  |

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