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Fair Value (Level 3 Reconciliation) (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
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Balance at beginning of period | $ (286) | $ 10 | $ (148) | $ 49
Included in earnings | 29 | (43) | 21 | (34)
Included in other comprehensive income | (29) | (73) | (22) | (37)
Included in regulatory (assets) liabilities | 2 | (3) | 9 | 3
Settlements | 7 | (1) | 23 | (3)
Transfers of assets (liabilities) into Level 3 | 0 | (101) | (159) | (189)
Transfers of (assets) liabilities out of Level 3 | 2 | 2 | 1 | 2
Balance at end of period | (275) | (209) | (275) | (209)
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | 30 | (52) | 22 | (40)
Interest Rate Derivatives |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Balance at beginning of period | (281) | (60) | (128) | (1)
Included in earnings | (1) | 0 | (1) | 0
Included in other comprehensive income | (29) | (36) | (30) | (3)
Included in regulatory (assets) liabilities | 0 | 0 | 0 | 0
Settlements | 12 | 4 | 19 | 0
Transfers of assets (liabilities) into Level 3 | 0 | (101) | (159) | (189)
Transfers of (assets) liabilities out of Level 3 | 2 | 2 | 2 | 2
Balance at end of period | (297) | (191) | (297) | (191)
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | (1) | 0 | (1) | 0
Cross Currency Swaps |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Balance at beginning of period | 0 | 15 | (18) | 10
Included in earnings | 0 | (3) | 0 | (5)
Included in other comprehensive income | 0 | (37) | 8 | (34)
Included in regulatory (assets) liabilities | 0 | 0 | 0 | 0
Settlements | 0 | 4 | 11 | 8
Transfers of assets (liabilities) into Level 3 | 0 | 0 | 0 | 0
Transfers of (assets) liabilities out of Level 3 | 0 | 0 | (1) | 0
Balance at end of period | 0 | (21) | 0 | (21)
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | 0 | (2) | 0 | (2)
Foreign Currency |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Balance at beginning of period | 47 | 38 | 51 | 22
Included in earnings | 14 | 4 | 12 | 21
Included in other comprehensive income | 0 | 0 | 0 | 0
Included in regulatory (assets) liabilities | 0 | 0 | 0 | 0
Settlements | (1) | (1) | (3) | (2)
Transfers of assets (liabilities) into Level 3 | 0 | 0 | 0 | 0
Transfers of (assets) liabilities out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | 60 | 41 | 60 | 41
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | 13 | 2 | 10 | 18
Commodity & Other |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Balance at beginning of period | (52) | 17 | (53) | 18
Included in earnings | 16 | (44) | 10 | (50)
Included in other comprehensive income | 0 | 0 | 0 | 0
Included in regulatory (assets) liabilities | 2 | (3) | 9 | 3
Settlements | (4) | (8) | (4) | (9)
Transfers of assets (liabilities) into Level 3 | 0 | 0 | 0 | 0
Transfers of (assets) liabilities out of Level 3 | 0 | 0 | 0 | 0
Balance at end of period | (38) | (38) | (38) | (38)
Total gains/(losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets and liabilities held at the end of the period | $ 18 | $ (52) | $ 13 | $ (56)

X
- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets). Such unrealized (holding) gains or losses relate to those derivative assets and liabilities still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References No definition available. + Details
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- Details
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity. + References No definition available. + Details
Name: | aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesGainLossIncludedInOtherComprehensiveIncome
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- Definition This element represents transfers in to derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
Name: | aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesTransfersIn
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- Definition This element represents transfers out of derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
Name: | aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesTransfersOut
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- Definition This element represents net derivative assets and liabilities measured at fair value using significant unobservable inputs (Level 3) which are required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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- Definition Settlements that have taken place during the period in relation to derivative assets and liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy. + References No definition available. + Details
Name: | aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisDerivativeAssetsLiabilitiesSettlements
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- Definition This element represents total gains or losses for the period (realized and unrealized), arising from derivative assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in regulatory assets or liabilities. + References No definition available. + Details
Name: | aes_FairValueMeasurmentsWithUnobservableInputsReconciliationRecurringBasisRegulatoryAssetsLiabilities
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