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Equity Reclassifications Out of AOCL (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Non-regulated revenue | $ 1,904 us-gaap_ElectricalGenerationRevenue |  | $ 2,120 us-gaap_ElectricalGenerationRevenue |
Regulated cost of sales | 1,807 us-gaap_CostOfTransmission |  | 1,932 us-gaap_CostOfTransmission |
Non-regulated cost of sales | 1,456 us-gaap_ElectricProductionExpense |  | 1,536 us-gaap_ElectricProductionExpense |
Other income | 16 us-gaap_OtherIncome |  | 12 us-gaap_OtherIncome |
Interest expense | (363)us-gaap_InterestExpense |  | (373)us-gaap_InterestExpense |
Foreign currency transaction losses | (23)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  | (19)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES | 335 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |  | 118 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Income tax expense | (96)us-gaap_IncomeTaxExpenseBenefit |  | (54)us-gaap_IncomeTaxExpenseBenefit |
Net equity in earnings of affiliates | 15 us-gaap_IncomeLossFromEquityMethodInvestments |  | 25 us-gaap_IncomeLossFromEquityMethodInvestments |
INCOME FROM CONTINUING OPERATIONS | 254 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  | 89 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |
Net loss from disposal and impairments of discontinued businesses | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  | (43)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |
Net income | 254 us-gaap_ProfitLoss |  | 66 us-gaap_ProfitLoss |
Income from continuing operations attributable to noncontrolling interests | 112 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity |  | 136 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity |
Interest income | 90 us-gaap_InvestmentIncomeInterest |  | 63 us-gaap_InvestmentIncomeInterest |
NET INCOME ATTRIBUTABLE TO THE AES CORPORATION | 142 us-gaap_NetIncomeLoss |  | (58)us-gaap_NetIncomeLoss |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 10 us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (10)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember | [1] | (27)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember | [1]
Unrealized Derivative Losses, Net [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Non-regulated revenue | 5 us-gaap_ElectricalGenerationRevenue / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | 13 us-gaap_ElectricalGenerationRevenue / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
Non-regulated cost of sales | 0 us-gaap_ElectricProductionExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | 1 us-gaap_ElectricProductionExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
Interest expense | (25)us-gaap_InterestExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | (32)us-gaap_InterestExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
Foreign currency transaction losses | 6 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | (3)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES | (14)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | (21)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
Income tax expense | 2 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | 3 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
Net equity in earnings of affiliates |  |  | (1)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
INCOME FROM CONTINUING OPERATIONS | (12)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | (19)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
Income from continuing operations attributable to noncontrolling interests | 3 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | 0 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
NET INCOME ATTRIBUTABLE TO THE AES CORPORATION | (9)us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1] | (19)us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_UnrealizedDerivativeLossesNetMember | [1]
Amortization Of Defined Benefit Pension Actuarial Loss, Net [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Regulated cost of sales | (8)us-gaap_CostOfTransmission / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1] | (8)us-gaap_CostOfTransmission / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1]
Non-regulated cost of sales | 0 us-gaap_ElectricProductionExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1] | (1)us-gaap_ElectricProductionExpense / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1]
INCOME FROM CONTINUING OPERATIONS BEFORE TAXES AND EQUITY IN EARNINGS OF AFFILIATES | (8)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1] | (9)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1]
Income tax expense | 3 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1] | 3 us-gaap_IncomeTaxExpenseBenefit / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1]
INCOME FROM CONTINUING OPERATIONS | (5)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1] | (6)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1]
Net income | (5)us-gaap_ProfitLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1] | (6)us-gaap_ProfitLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1]
Income from continuing operations attributable to noncontrolling interests | 4 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1] | 4 us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1]
NET INCOME ATTRIBUTABLE TO THE AES CORPORATION | (1)us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1] | (2)us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_AmortizationOfDefinedBenefitPensionActuarialLossNetMember | [1]
Foreign Currency Translation Adjustment, Net [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net loss from disposal and impairments of discontinued businesses | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_ForeignCurrencyTranslationAdjustmentNetMember | [1] | (6)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_ForeignCurrencyTranslationAdjustmentNetMember | [1]
NET INCOME ATTRIBUTABLE TO THE AES CORPORATION | $ 0 us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_ForeignCurrencyTranslationAdjustmentNetMember | [1] | $ (6)us-gaap_NetIncomeLoss / us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis = us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember / us-gaap_StatementEquityComponentsAxis = aes_ForeignCurrencyTranslationAdjustmentNetMember | [1]
[1] | Amounts in parentheses indicate debits to the Condensed Consolidated Statements of Operations.

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- Definition Cost incurred for transmission operations and maintenance by total kilowatt-hours paid to sources. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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