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Equity (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | Dec. 31, 2011
Changes In Equity Disclosure [Line Items] |  |  |
Beginning Balance | $ 9,729 | $ 10,413 |
Net income | 515 | 483 |
Change in fair value of available-for-sale securities, net of income tax | 0 | 0 |
Foreign currency translation adjustment, net of income tax | 141 | 128 |
Actuarial gains and losses and amortization of prior service costs, net of income tax | 6 | 3 |
Change in derivative fair value, including a reclassification to earnings, net of income tax | 107 | 71 |
Capital contributions from noncontrolling interests | 6 | 1 |
Distributions to noncontrolling interests | 14 | 16 |
Disposition of businesses | 37 |  |
Acquisition of treasury stock |  | 63 |
Issuance and exercise of stock-based compensation benefit plans, net of income tax | 19 | 23 |
Acquisition of subsidiary shares from noncontrolling interests | 1 |  |
Ending Balance | 10,471 | 11,042 |
Accumulated Other Comprehensive Loss |  |  |
Foreign currency translation adjustment | 1,875 |  | 1,967
Unrealized derivative losses, net | 444 |  | 534
Unfunded pension obligation | 256 |  | 257
Accumulated other comprehensive loss | 2,575 |  | 2,758
Net Income Attributable To Parent And Transfers To From Noncontrolling Interests [Abstract] |  |  |
Net income (loss) attributable to The AES Corporation | 341 | 224 |
The AES Corporation Stockholders' Equity |  |  |
Changes In Equity Disclosure [Line Items] |  |  |
Beginning Balance | 5,946 | 6,473 |
Net income | 341 | 224 |
Change in fair value of available-for-sale securities, net of income tax |  | (1) |
Foreign currency translation adjustment, net of income tax | 92 | 74 |
Actuarial gains and losses and amortization of prior service costs, net of income tax | 1 | 1 |
Change in derivative fair value, including a reclassification to earnings, net of income tax | 90 | 61 |
Capital contributions from noncontrolling interests | 0 | 0 |
Distributions to noncontrolling interests | 0 | 0 |
Disposition of businesses | 0 |  |
Acquisition of treasury stock |  | 63 |
Issuance and exercise of stock-based compensation benefit plans, net of income tax | 19 | 23 |
Acquisition of subsidiary shares from noncontrolling interests | 0 |  |
Ending Balance | 6,489 | 6,792 |
Noncontrolling Interests |  |  |
Changes In Equity Disclosure [Line Items] |  |  |
Beginning Balance | 3,783 | 3,940 |
Net income | 174 | 259 |
Change in fair value of available-for-sale securities, net of income tax |  | 0 |
Foreign currency translation adjustment, net of income tax | 49 | 54 |
Actuarial gains and losses and amortization of prior service costs, net of income tax | 5 | 2 |
Change in derivative fair value, including a reclassification to earnings, net of income tax | 17 | 10 |
Capital contributions from noncontrolling interests | 6 | 1 |
Distributions to noncontrolling interests | 14 | 16 |
Disposition of businesses | 37 |  |
Acquisition of treasury stock |  | 0 |
Issuance and exercise of stock-based compensation benefit plans, net of income tax | 0 | 0 |
Acquisition of subsidiary shares from noncontrolling interests | 1 |  |
Ending Balance | $ 3,982 | $ 4,250 |

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