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Equity (Details) (USD $) | 3 Months Ended | 12 Months Ended | 24 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 | Mar. 15, 2010
Stock Purchase Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock sold to CIC |  |  |  |  |  |  |  |  |  |  |  |  | 125,468,788
Price per share paid by CIC |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.60
Aggregate proceeds from shares sold to CIC |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,580,000,000
CIC's ownership percentage in AES after sale of common stock |  |  |  |  |  |  |  |  | 15.00% |  |  |  |
Minimum ownership percentage allowing CIC to nonimate one member to AES Board of Directors |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Maximum ownership percentage requiring CIC to vote its shares in accordance with recommendations of the Company |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Percentage ownership at which standstill and lock-up restrictions terminate |  |  |  |  |  |  |  |  | 5.00% |  |  |  |
Stock Repurchase Plan [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Total repurchase amount authorized |  |  |  |  |  |  |  |  | 500,000,000 |  |  |  |
Acquisition of treasury stock (shares) |  |  |  |  |  |  |  |  |  | 25,541,980 |  | 33,924,805 |
Treasury Stock Value Acquired Cost Method Excluding Commissions |  |  |  |  |  |  |  |  |  | 279,000,000 |  | 378,000,000 |
Treasury Stock Acquired Average Cost Per Share |  |  |  |  |  |  |  |  |  | $ 10.93 |  | $ 11.16 |
Treasury stock, shares | 42,386,961 |  |  |  | 17,287,073 |  |  |  | 42,386,961 | 17,287,073 |  | 42,386,961 |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 1,967,000,000 |  |  |  | 1,824,000,000 |  |  |  | 1,967,000,000 | 1,824,000,000 |  | 1,967,000,000 |
Unrealized derivative losses | 534,000,000 |  |  |  | 344,000,000 |  |  |  | 534,000,000 | 344,000,000 |  | 534,000,000 |
Unfunded pension obligation | 257,000,000 |  |  |  | 216,000,000 |  |  |  | 257,000,000 | 216,000,000 |  | 257,000,000 |
Securities available-for-sale | 0 |  |  |  | (1,000,000) |  |  |  | 0 | (1,000,000) |  | 0 |
Total | 2,758,000,000 |  |  |  | 2,383,000,000 |  |  |  | 2,758,000,000 | 2,383,000,000 |  | 2,758,000,000 |
Net Income Attributable To Parent And Transfers To From Noncontrolling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |
Transfers To From The Noncontrolling Interests [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase in The AES Corporation's paid-in capital for sale of subsidiary shares |  |  |  |  |  |  |  |  | 19,000,000 | 0 |  |  |
Decrease in The AES Corporation's paid-in capital for purchase of subsidiary shares |  |  |  |  |  |  |  |  | 0 | (25,000,000) |  |  |
Net transfers (to) from noncontrolling interests |  |  |  |  |  |  |  |  | 19,000,000 | (25,000,000) |  |  |
Change from net income attributable to The AES Corporation and transfers (to) from noncontrolling interests |  |  |  |  |  |  |  |  | $ 77,000,000 | $ (16,000,000) |  |  |
Mong Duong [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest purchased |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Generation Capacity (MW) | 1,200 |  |  |  |  |  |  |  | 1,200 |  |  | 1,200 |
Ownership after all transactions |  |  |  |  |  |  |  |  | 51.00% |  |  |  |
Mong Duong [Member] | Posco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest sold |  |  |  |  |  |  |  |  | 30.00% |  |  |  |
Mong Duong [Member] | CIC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest sold |  |  |  |  |  |  |  |  | 19.00% |  |  |  |

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- Definition The standstill and lock-up restrictions agreed upon under the Stockholder Agreement at such time as China Investment Corporation holds an ownership percentage equal to or less than this percentage. The standstill restriction generally prohibits China Investment Corporation from purchasing additional securities of the Company beyond the level acquired by it under the stock purchase agreement entered into between Investor and the Company on November 6, 2009. Under the lock-up restriction the China Investment Corporation may not sell its shares for a period of 12 months following the closing, subject to certain exceptions. + References No definition available. + Details
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