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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended | 27 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 07, 2010 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011
Changes In Equity Disclosure [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | $ 9,729 | $ 10,413 |  |  |
Net income (loss) |  | (1,402) | 175 | (680) | 1,085 |  |  |
Total change in fair value of available-for-sale securities, net of income tax |  | 0 | (1) | 0 | (3) |  |  |
Total foreign currency translation adjustment, net of income tax |  | (25) | (590) | (269) | (328) |  |  |
Total pension adjustments, net of income tax |  | (6) | (5) | (19) | (12) |  |  |
Total change in fair value of derivatives, net of income tax |  | (28) | (183) | (14) | (193) |  |  |
Capital contributions from noncontrolling interests |  |  |  | 12 | 9 |  |  |
Distributions to noncontrolling interests |  |  |  | (625) | (990) |  |  |
Disposition of businesses |  |  |  | (37) | (1) |  |  |
Acquisition of treasury stock |  |  |  | (301) | (225) |  |  |
Issuance and exercise of stock-based compensation benefit plans, net of income tax |  |  |  | 40 | 43 |  |  |
Acquisition of subsidiary shares from noncontrolling interests |  |  |  | (8) | 0 |  |  |
Dividends declared on common stock ($0.04 per share) |  |  |  | (30) | 0 |  |  |
Sale of subsidiary shares to noncontrolling interest |  |  |  | 0 | 35 |  |  |
Ending Balance |  | 7,836 | 9,857 | 7,836 | 9,857 | 7,836 |  |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  | 2,125 |  | 2,125 |  | 2,125 |  | 1,967
Unrealized derivative losses, net |  | 528 |  | 528 |  | 528 |  | 534
Unfunded pension obligation |  | 252 |  | 252 |  | 252 |  | 257
Accumulated other comprehensive loss |  | 2,905 |  | 2,905 |  | 2,905 |  | 2,758
Dividend |  |  |  |  |  |  |  |
Common Stock Dividends Per Share Declared |  | $ 0.04 | $ 0 | $ 0.04 | $ 0 |  |  |
Stock Repurchase Plan [Abstract] |  |  |  |  |  |  |  |
Total repurchase amount authorized | 500 |  |  |  |  |  | 680 |
Acquisition of treasury stock (shares) |  | 6,046,021 |  | 24,790,384 |  | 58,715,189 |  |
Treasury Stock Value Acquired Cost Method Excluding Commissions |  | 71 |  | 301 |  | 680 |  |
Treasury Stock Acquired Average Cost Per Share |  | $ 11.71 |  | $ 12.16 |  | $ 11.58 |  |
Treasury stock, shares |  | 66,437,231 |  | 66,437,231 |  | 66,437,231 |  | 42,386,961
The AES Corporation Stockholders' Equity |  |  |  |  |  |  |  |
Changes In Equity Disclosure [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 5,946 | 6,473 |  |  |
Net income (loss) |  |  |  | (1,087) | 267 |  |  |
Total change in fair value of available-for-sale securities, net of income tax |  |  |  | 0 | (3) |  |  |
Total foreign currency translation adjustment, net of income tax |  |  |  | (158) | (178) |  |  |
Total pension adjustments, net of income tax |  |  |  | 5 | 4 |  |  |
Total change in fair value of derivatives, net of income tax |  |  |  | 6 | (167) |  |  |
Capital contributions from noncontrolling interests |  |  |  | 0 | 0 |  |  |
Distributions to noncontrolling interests |  |  |  | 0 | 0 |  |  |
Disposition of businesses |  |  |  | 0 | 0 |  |  |
Acquisition of treasury stock |  |  |  | (301) | (225) |  |  |
Issuance and exercise of stock-based compensation benefit plans, net of income tax |  |  |  | 40 | 43 |  |  |
Acquisition of subsidiary shares from noncontrolling interests |  |  |  | 3 | 0 |  |  |
Dividends declared on common stock ($0.04 per share) |  |  |  | (30) | 0 |  |  |
Sale of subsidiary shares to noncontrolling interest |  |  |  | 0 | 19 |  |  |
Ending Balance |  | 4,424 | 6,233 | 4,424 | 6,233 | 4,424 |  |
Noncontrolling Interests |  |  |  |  |  |  |  |
Changes In Equity Disclosure [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  |  | 3,783 | 3,940 |  |  |
Net income (loss) |  |  |  | 407 | 818 |  |  |
Total change in fair value of available-for-sale securities, net of income tax |  |  |  | 0 | 0 |  |  |
Total foreign currency translation adjustment, net of income tax |  |  |  | (111) | (150) |  |  |
Total pension adjustments, net of income tax |  |  |  | 14 | 8 |  |  |
Total change in fair value of derivatives, net of income tax |  |  |  | (20) | (26) |  |  |
Capital contributions from noncontrolling interests |  |  |  | 12 | 9 |  |  |
Distributions to noncontrolling interests |  |  |  | (625) | (990) |  |  |
Disposition of businesses |  |  |  | (37) | (1) |  |  |
Acquisition of treasury stock |  |  |  | 0 | 0 |  |  |
Issuance and exercise of stock-based compensation benefit plans, net of income tax |  |  |  | 0 | 0 |  |  |
Acquisition of subsidiary shares from noncontrolling interests |  |  |  | (11) | 0 |  |  |
Dividends declared on common stock ($0.04 per share) |  |  |  | 0 | 0 |  |  |
Sale of subsidiary shares to noncontrolling interest |  |  |  | 0 | 16 |  |  |
Ending Balance |  | $ 3,412 | $ 3,624 | $ 3,412 | $ 3,624 | $ 3,412 |  |

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