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Derivative Insturments and Hedging Activities - Part 4 (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
IPL Regulatory Activity [Abstract] |  |  |  |
(Increase) decrease in regulatory assets | $ 4 | $ (4) | $ (1) | $ (6)
Increase (decrease) in regulatory liabilities | $ 0 | $ (3) | $ (1) | $ 3

X
- Definition The change in regulatory assets resulting from the change in the fair value of derivative instruments accounted for in accordance with accounting standards for regulated operations. + References No definition available. + Details
Name: | aes_ChangeInRegulatoryAssetResultingFromChangeInDerivativeFairValue
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The change in regulatory liabilities resulting from the change in the fair value of derivative instruments accounted for in accordance with accounting standards for regulated operations. + References No definition available. + Details
Name: | aes_ChangeInRegulatoryLiabilityResultingFromChangeInDerivativeFairValue
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | aes_IplRegulatoryActivityAbstract
Namespace Prefix: | aes_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration