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Fair Value (Level 3 Reconciliation) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at beginning of period | $ (4) | $ (341)
Total gains (losses) (realized and unrealized): |  |
Included in earnings | 25 | 3
Included in other comprehensive income - derivative activity | (65) | (21)
Included in other comprehensive income - foreign currency translation activity | (18) | 1
Included in regulatory (assets) liabilities | (3) | (2)
Settlements | 8 | 22
Transfers of (assets) liabilities out of Level 3 | 71 | 334
Balance at end of period | 14 | (4)
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 | 25 | 2
Interest Rate [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at beginning of period | (101) | (412)
Total gains (losses) (realized and unrealized): |  |
Included in earnings | 0 | 0
Included in other comprehensive income - derivative activity | (64) | (21)
Included in other comprehensive income - foreign currency translation activity | 0 | 4
Included in regulatory (assets) liabilities | 0 | 0
Settlements | 8 | 23
Transfers of (assets) liabilities out of Level 3 | 70 | 334
Balance at end of period | (87) | (72)
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 | 0
Foreign currency derivatives [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at beginning of period | 93 | 72
Total gains (losses) (realized and unrealized): |  |
Included in earnings | 26 | 3
Included in other comprehensive income - derivative activity | (1) | 0
Included in other comprehensive income - foreign currency translation activity | (18) | (3)
Included in regulatory (assets) liabilities | 0 | 0
Settlements | 0 | (1)
Transfers of (assets) liabilities out of Level 3 | 1 | 0
Balance at end of period | 101 | 71
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 | 26 | 2
Commodity [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at beginning of period | 4 | (1)
Total gains (losses) (realized and unrealized): |  |
Included in earnings | (1) | 0
Included in other comprehensive income - derivative activity | 0 | 0
Included in other comprehensive income - foreign currency translation activity | 0 | 0
Included in regulatory (assets) liabilities | (3) | (2)
Settlements | 0 | 0
Transfers of (assets) liabilities out of Level 3 | 0 | 0
Balance at end of period | 0 | (3)
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

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
Name: | aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLossIncludedInOtherIncome
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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_FairValueMeasurementsWithUnobservableInputsReconciliationRecurringBasisRegulatoryAssetsLiabilities
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesGainLossIncludedInEarnings
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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 - derivatives (a separate component of shareholders' equity). + References No definition available. + Details
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Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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 - foreign currency (a separate component of shareholders' equity. + References No definition available. + Details
Name: | aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesGainLossIncludedInOtherComprehensiveIncomeForeignCurrency
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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
Name: | aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Namespace Prefix: | aes_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeGainLossOnDerivativeNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Balance Type: | na
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