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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 |
Components Of Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 445,000,000 | 175,000,000 | 427,000,000 | 483,000,000 | (169,000,000) | 397,000,000 | 429,000,000 | 402,000,000 | 1,530,000,000 | 1,059,000,000 | 1,755,000,000 |  |
Available-for-sale securities activity |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of available-for-sale securities, net of income tax (expense) benefit of $0, $(4) and $0, respectively |  |  |  |  |  |  |  |  | 1,000,000 | (5,000,000) | 8,000,000 |  |
Reclassification to earnings, net of income tax (expense) benefit of $0, $0, and $0, respectively |  |  |  |  |  |  |  |  | (2,000,000) | 0 | (2,000,000) |  |
Other Comprehensive Income (Loss), Available-for-sale Securities, net of tax, total |  |  |  |  |  |  |  |  | (1,000,000) | (5,000,000) | 6,000,000 |  |
Foreign currency activity |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments, net of tax |  |  |  |  |  |  |  |  | (484,000,000) | 468,000,000 | 746,000,000 |  |
Reclassification to eranings, net of income tax |  |  |  |  |  |  |  |  | 188,000,000 | 142,000,000 | (4,000,000) |  |
Total foreign currency translation adjustments |  |  |  |  |  |  |  |  | (296,000,000) | 610,000,000 | 742,000,000 |  |
Derivative activity: |  |  |  |  |  |  |  |  |  |  |  |  |
Change in derivative fair value, net of income tax (expense) benefit of $0, $34 and $(29), respectively |  |  |  |  |  |  |  |  | (379,000,000) | (242,000,000) | 214,000,000 |  |
Reclassification to earnings, net of income tax (expense) benefit of $0, $(41) and $(19), respectively |  |  |  |  |  |  |  |  | 137,000,000 | 162,000,000 | (141,000,000) |  |
Total change in fair value of derivatives |  |  |  |  |  |  |  |  | (242,000,000) | (80,000,000) | 73,000,000 |  |
Pension activity |  |  |  |  |  |  |  |  |  |  |  |  |
Change in unfunded pension obligation, net of income tax |  |  |  |  |  |  |  |  | (223,000,000) | (111,000,000) | (139,000,000) |  |
Reclassificaton to earnings, net of income tax |  |  |  |  |  |  |  |  | 13,000,000 | 23,000,000 | 0 |  |
Total change in unfunded pension obligations |  |  |  |  |  |  |  |  | (210,000,000) | (88,000,000) | (139,000,000) |  |
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | (749,000,000) | 437,000,000 | 682,000,000 |  |
Comprehensive income |  |  |  |  |  |  |  |  | 781,000,000 | 1,496,000,000 | 2,437,000,000 |  |
Less: Comprehensive income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (1,098,000,000) | (1,108,000,000) | (1,485,000,000) |  |
Total comprehensive income |  |  |  |  |  |  |  |  | (317,000,000) | 388,000,000 | 952,000,000 |  |
Components Of Comprehensive Income (Parentheticals) |  |  |  |  |  |  |  |  |  |  |  |  |
Change in fair value of available-for-sale securities, income tax |  |  |  |  |  |  |  |  | 0 | 3,000,000 | (4,000,000) |  |
Available-for-sale securities reclassification to earnings, income tax |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Foreign currency translation adjustments, income tax |  |  |  |  |  |  |  |  | 18,000,000 | (11,000,000) | (78,000,000) |  |
Foreign currency translation reclassification to earnings, income tax |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |
Change in derivative fair value, income tax |  |  |  |  |  |  |  |  | 108,000,000 | 56,000,000 | 34,000,000 |  |
Derivative reclassification to earnings, income tax |  |  |  |  |  |  |  |  | (22,000,000) | (41,000,000) | (41,000,000) |  |
Change in unfunded pension obligation, income tax |  |  |  |  |  |  |  |  | 117,000,000 | 57,000,000 | 70,000,000 |  |
Pension activity reclassification to earnings, income tax | (6,000,000) |  |  |  | (12,000,000) |  |  |  | (6,000,000) | (12,000,000) | (1,000,000) | (6,000,000) |
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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