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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 24 Months Ended | 27 Months Ended | 30 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Jul. 09, 2012 | Mar. 31, 2012 | Jun. 30, 2012 | Dec. 31, 2011
Stock Repurchase Plan [Abstract] |  |  |  |  |  |  |  |
Total repurchase amount authorized |  |  |  |  | $ 500 | $ 680 |  |
Acquisition of treasury stock (shares) |  |  | 18,744,363 |  |  |  | 52,669,168 |
Treasury Stock Value Acquired Cost Method Excluding Commissions |  |  | 230 |  |  |  | 608 |
Treasury Stock Acquired Average Cost Per Share |  |  | $ 12.31 |  |  |  | $ 11.57 |
Changes In Equity Disclosure [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  | 9,729 | 10,413 |  |  |  |
Net income | 207 | 427 | 722 | 910 |  |  |  |
Total change in fair value of available-for-sale securities, net of income tax | 1 | 1 | 1 | 1 |  |  |  |
Total foreign currency translation adjustment, net of income tax | (385) | 134 | (244) | 262 |  |  |  |
Total pension adjustments, net of income tax | 7 | 4 | 13 | 7 |  |  |  |
Total change in fair value of derivatives, net of income tax | (93) | (81) | 14 | (10) |  |  |  |
Capital contributions from noncontrolling interests |  |  | 12 | 3 |  |  |  |
Distributions to noncontrolling interests |  |  | 507 | 679 |  |  |  |
Disposition of businesses |  |  | 37 | 2 |  |  |  |
Acquisition of treasury stock |  |  | 231 | 98 |  |  |  |
Issuance and exercise of stock-based compensation benefit plans, net of income tax |  |  | 34 | 33 |  |  |  |
Acquisition of subsidiary shares from noncontrolling interests |  |  | 4 | 0 |  |  |  |
Ending Balance | 9,501 |  | 9,501 |  |  |  | 9,501 |
Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 2,101 |  | 2,101 |  |  |  | 2,101 | 1,967
Unrealized derivative losses, net | 511 |  | 511 |  |  |  | 511 | 534
Unfunded pension obligation | 253 |  | 253 |  |  |  | 253 | 257
Accumulated other comprehensive loss | 2,865 |  | 2,865 |  |  |  | 2,865 | 2,758
Net Income Attributable To Parent And Transfers To From Noncontrolling Interests [Abstract] |  |  |  |  |  |  |  |
Net income (loss) attributable to The AES Corporation | 140 | 174 | 481 | 398 |  |  |  |
The AES Corporation Stockholders' Equity |  |  |  |  |  |  |  |
Changes In Equity Disclosure [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  | 5,946 | 6,473 |  |  |  |
Net income |  |  | 481 | 398 |  |  |  |
Total change in fair value of available-for-sale securities, net of income tax |  |  | 0 | (2) |  |  |  |
Total foreign currency translation adjustment, net of income tax |  |  | (134) | 118 |  |  |  |
Total pension adjustments, net of income tax |  |  | 4 | 2 |  |  |  |
Total change in fair value of derivatives, net of income tax |  |  | 23 | (13) |  |  |  |
Capital contributions from noncontrolling interests |  |  | 0 | 0 |  |  |  |
Distributions to noncontrolling interests |  |  | 0 | 0 |  |  |  |
Disposition of businesses |  |  | 0 | 0 |  |  |  |
Acquisition of treasury stock |  |  | 231 | 98 |  |  |  |
Issuance and exercise of stock-based compensation benefit plans, net of income tax |  |  | 34 | 33 |  |  |  |
Acquisition of subsidiary shares from noncontrolling interests |  |  | 0 | 0 |  |  |  |
Ending Balance | 6,123 | 6,911 | 6,123 | 6,911 |  |  | 6,123 |
Noncontrolling Interests |  |  |  |  |  |  |  |
Changes In Equity Disclosure [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  |  | 3,783 | 3,940 |  |  |  |
Net income |  |  | 241 | 512 |  |  |  |
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 |  |  | (110) | 144 |  |  |  |
Total pension adjustments, net of income tax |  |  | 9 | 5 |  |  |  |
Total change in fair value of derivatives, net of income tax |  |  | (9) | 3 |  |  |  |
Capital contributions from noncontrolling interests |  |  | 12 | 3 |  |  |  |
Distributions to noncontrolling interests |  |  | 507 | 679 |  |  |  |
Disposition of businesses |  |  | 37 | 2 |  |  |  |
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 |  |  | 4 | 0 |  |  |  |
Ending Balance | $ 3,378 | $ 3,926 | $ 3,378 | $ 3,926 |  |  | $ 3,378 |

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