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Acquisitions and Dispositions (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Feb. 09, 2012 USD ($) | Feb. 09, 2012 EUR (€) | Dec. 31, 2011 USD ($) | Sep. 30, 2011 USD ($) | Jun. 30, 2011 USD ($) | Mar. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Sep. 30, 2010 USD ($) | Jun. 30, 2010 USD ($) | Mar. 31, 2010 USD ($) | Dec. 31, 2011 USD ($) mw | Dec. 31, 2011 EUR (€) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2008 USD ($) | Dec. 31, 2011 Senior Note 650 Due 2016 [Member] USD ($) | Dec. 31, 2011 Senior Note 725 Due 2021 [Member] USD ($) | Dec. 31, 2011 Senior Unsecured Note 7375 Due 2021 [Member] USD ($) | Dec. 31, 2010 Senior Unsecured Note 7375 Due 2021 [Member] USD ($) | Dec. 31, 2011 Senior Secured Term Loan LIBOR Plus 325 Due 2018 [Member] USD ($) | Dec. 31, 2010 Senior Secured Term Loan LIBOR Plus 325 Due 2018 [Member] USD ($) | Dec. 31, 2011 Senior Unsecured Note 7375 Due 2021 And Senior Secured Term Loan Libor Plus 325 [Member] USD ($) | Dec. 31, 2011 Revolving Credit Loan Facility LIBOR Plus 300 Due 2015 [Member] USD ($) | Dec. 31, 2010 Revolving Credit Loan Facility LIBOR Plus 300 Due 2015 [Member] USD ($) | Dec. 31, 2011 DPL Acquisition [Member] USD ($) mw integer | Dec. 31, 2011 DPL Acquisition [Member] USD ($) mw integer | Dec. 31, 2010 DPL Acquisition [Member] USD ($) | Dec. 31, 2011 DPL Acquisition [Member] Senior Note 650 Due 2016 [Member] USD ($) | Dec. 31, 2011 DPL Acquisition [Member] Senior Note 725 Due 2021 [Member] USD ($) | Dec. 31, 2011 DPL Acquisition [Member] Senior Unsecured Note 7375 Due 2021 [Member] USD ($) | Dec. 31, 2011 DPL Acquisition [Member] Senior Secured Term Loan LIBOR Plus 325 Due 2018 [Member] USD ($) | Dec. 31, 2011 DPL Acquisition [Member] Revolving Credit Loan Facility LIBOR Plus 300 Due 2015 [Member] USD ($)
Business Acquisition, Entity Acquired and Reason for Acquisition [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recourse debt |  |  | $ 6,485,000,000 |  |  |  | $ 4,612,000,000 |  |  |  | $ 6,485,000,000 |  | $ 4,612,000,000 |  |  |  |  | $ 1,000,000,000 | $ 0 | $ 1,042,000,000 | $ 0 | $ 2,050,000,000 | $ 295,000,000 | $ 0 |  |  |  |  |  | $ 1,000,000,000 | $ 1,050,000,000 | $ 251,000,000
Non-recourse debt |  |  | 16,088,000,000 |  |  |  | 14,176,000,000 |  |  |  | 16,088,000,000 |  | 14,176,000,000 |  |  | 450,000,000 | 800,000,000 |  |  |  |  |  |  |  |  |  |  | 450,000,000 | 800,000,000 |  |  |
Customers Served |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 500,000 |  |  |  |  |  |
Generation Capacity Mega Watts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,800 | 3,800 |  |  |  |  |  |
Percent acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreed enterprise value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,719,000,000 | 4,719,000,000 |  |  |  |  |  |
Less: fair value of assumed long-term debt outstanding, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,255,000,000) | (1,255,000,000) |  |  |  |  |  |
Cash consideration paid to DPL's common stockholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,464,000,000 | 3,464,000,000 |  |  |  |  |  |
Add: cash paid for outstanding stock-based awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000,000 | 19,000,000 |  |  |  |  |  |
Total cash consideration paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,483,000,000 | 3,483,000,000 |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 116,000,000 | 116,000,000 |  |  |  |  |  |
Accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 278,000,000 | 278,000,000 |  |  |  |  |  |
Inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 124,000,000 | 124,000,000 |  |  |  |  |  |
Other Current Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 41,000,000 | 41,000,000 |  |  |  |  |  |
Property, plant & equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,549,000,000 | 2,549,000,000 |  |  |  |  |  |
Intangible assets subject to amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166,000,000 | 166,000,000 |  |  |  |  |  |
Intangible assets - indefinite-lived |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 |  |  |  |  |  |
Regulatory assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 201,000,000 | 201,000,000 |  |  |  |  |  |
Other Noncurrent Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,000,000 | 58,000,000 |  |  |  |  |  |
Current liabilities, excluding current portion of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (401,000,000) | (401,000,000) |  |  |  |  |  |
Non-recourse debt (current and noncurrent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,255,000,000) | (1,255,000,000) |  |  |  |  |  |
Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (558,000,000) | (558,000,000) |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (117,000,000) | (117,000,000) |  |  |  |  |  |
Other noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (195,000,000) | (195,000,000) |  |  |  |  |  |
Redeemable preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,000,000) | (18,000,000) |  |  |  |  |  |
Net identifiable assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 994,000,000 | 994,000,000 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,489,000,000 | 2,489,000,000 |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,483,000,000 | 3,483,000,000 |  |  |  |  |  |
Interest in Ohio Valley Electric Corp |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.90% | 4.90% |  |  |  |  |  |
Business Acquisition, Pro Forma Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  | 4,269,000,000 | 4,345,000,000 | 4,471,000,000 | 4,189,000,000 | 4,230,000,000 | 3,924,000,000 | 3,838,000,000 | 3,836,000,000 | 17,274,000,000 |  | 15,828,000,000 | 13,110,000,000 |  |  |  |  |  |  |  |  |  |  | 154,000,000 |  |  |  |  |  |  |
Net income (loss) attributable to The AES Corporation |  |  | (209,000,000) | (131,000,000) | 174,000,000 | 224,000,000 | (436,000,000) | 114,000,000 | 144,000,000 | 187,000,000 | 58,000,000 |  | 9,000,000 | 658,000,000 |  |  |  |  |  |  |  |  |  |  | (6,000,000) |  |  |  |  |  |  |
Pro Forma Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,945,000,000 | 17,659,000,000 |  |  |  |  |
Pro Forma Net Income (Loss) Attributable to The AES Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 116,000,000 | 101,000,000 |  |  |  |  |
Pro forma adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92,000,000 | 198,000,000 |  |  |  |  |
Disposal Group Not Discontinued Operation Disposal Disclosures Abstract |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration Received |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance Incentive Bonus |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale from reversal of tax contingency |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Termination Payment |  |  |  |  |  |  |  |  |  |  |  |  | 102,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter Of Credit Provided To Support Termination Payment |  |  |  |  |  |  |  |  |  |  |  |  |  | 102,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain On Sale |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest sold |  |  |  |  |  |  |  |  |  |  | 80.00% | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation capacity of sold business |  |  |  |  |  |  |  |  |  |  | 1,199 | 1,199 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest prior to sale |  |  |  |  |  |  |  |  |  |  | 70.81% | 70.81% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale | 229,000,000 | 172,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional purchase option |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of additional purchase option |  |  | 36,000,000 |  |  |  |  |  |  |  | 36,000,000 | 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement with acquirer |  |  | 92,000,000 |  |  |  |  |  |  |  | 92,000,000 | 71,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds received at closing |  |  |  |  |  |  |  |  |  |  | $ 38,000,000 | € 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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