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Fair Value (Quantitative Information) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value | $ 5 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue | $ (4)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue | $ (341)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue
Interest rate derivatives |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value | (210)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember | (101)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember | (412)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember
Interest rate derivatives | Minimum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 3.75%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Interest rate derivatives | Maximum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 8.24%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Interest rate derivatives | Weighted Average |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 5.70%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Foreign Currency Embedded Derivative Argentine Peso |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value | 208 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeArgentinePesoMember |  |
Foreign Currency Embedded Derivative Argentine Peso | Minimum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 0.0875 aes_USDollarIndexationInArgentina / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeArgentinePesoMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Foreign Currency Embedded Derivative Argentine Peso | Maximum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 0.3366 aes_USDollarIndexationInArgentina / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeArgentinePesoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Foreign Currency Embedded Derivative Argentine Peso | Weighted Average |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 0.2131 aes_USDollarIndexationInArgentina / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeArgentinePesoMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Foreign Currency Embedded Derivative Euro |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value | 1 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeEuroMember |  |
Foreign Currency Embedded Derivative Euro | Minimum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 5.43%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeEuroMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Foreign Currency Embedded Derivative Euro | Maximum |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 8.24%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeEuroMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Foreign Currency Embedded Derivative Euro | Weighted Average |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Subsidiaries' credit risk | 6.84%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeEuroMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |
Commodity And Other |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |
Fair Value | $ 6 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_CommodityAndOtherDerivativeOtherMember |  |

X
- Definition The credit rating used by the parent company or subsidiary to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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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 The U.S. Dollar indexation in Argentina used to determine the fair value of derivative instruments at the balance sheet date. + References No definition available. + Details
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