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Fair Value (Quantitative Information) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
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Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Fair Value | $ (108)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue | $ 5 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue | $ 14 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue | $ (4)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue
Interest rate derivatives [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Fair Value | (302)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember | (210)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember | (87)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember | (101)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember
Interest rate derivatives [Member] | Minimum [Member] |  |  |  |
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 [Member] | Maximum [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 7.00%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Interest rate derivatives [Member] | Weighted Average [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 4.69%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = us-gaap_InterestRateContractMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Fair Value | 221 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeArgentinePesoMember |  |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Minimum [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 8.96 aes_USDollarIndexationInArgentina / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeArgentinePesoMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Maximum [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 35.91 aes_USDollarIndexationInArgentina / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeArgentinePesoMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Foreign Currency Embedded Derivative Argentine Peso [Member] | Weighted Average [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Argentine Peso to U.S. Dollar currency exchange rate after 1 year | 22.86 aes_USDollarIndexationInArgentina / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeArgentinePesoMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |
Foreign Currency Embedded Derivative Euro [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Fair Value | 2 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeEuroMember |  |  |
Foreign Currency Embedded Derivative Euro [Member] | Minimum [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 4.62%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeEuroMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Foreign Currency Embedded Derivative Euro [Member] | Maximum [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 7.00%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeEuroMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Foreign Currency Embedded Derivative Euro [Member] | Weighted Average [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 5.81%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_ForeignCurrencyEmbeddedDerivativeEuroMember / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |
Commodity And Other Derivative Other [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Fair Value | 4 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_CommodityAndOtherDerivativeOtherMember |  |  |
Cross Currency [Domain] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Fair Value | $ (33)aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_CrossCurrencyDomain | $ 0 aes_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetsLiabilitiesValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_CrossCurrencyDomain |  |
Cross Currency [Domain] | Minimum [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 2.84%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_CrossCurrencyDomain / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Cross Currency [Domain] | Maximum [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 2.84%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_CrossCurrencyDomain / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Cross Currency [Domain] | Weighted Average [Member] |  |  |  |
Fair Value Derivative Assets Liabilities Measured On Recurring Basis Unobservable Inputs [Abstract] |  |  |  |
Subsidiaries' credit risk | 2.84%aes_CreditRatingUsedToDetermineDerivativeFairValue / aes_FairValueDerivativeAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationAxis = aes_CrossCurrencyDomain / us-gaap_RangeAxis = us-gaap_WeightedAverageMember |  |  |

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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