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Equity Equity Transactions with Noncontrolling Interests (Details) (USD $) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Apr. 01, 2015 | Dec. 15, 2014 | Mar. 15, 2015 MW
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Sale of subsidiary shares to noncontrolling interests | $ (81,000,000)us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest | $ 0 us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest |  |  |  |
Future Noncontrolling Interest, Ownership by noncontrolling owner once transaction is complete | 30.00%aes_FutureNoncontrollingInterestOwnershipbynoncontrollingowneroncetransactioniscomplete |  |  |  |  |
IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Net proceeds received from sale of businesses | 247,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal | 0 us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  | 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 24.90%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member | 15.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member |
sales agreement, Buyer option to purchase ownership interest, exercised |  |  |  | 214,000,000 aes_SalesagreementBuyeroptiontopurchaseownershipinterestexercised / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member |  |
Gain on Disposition of Stock in Subsidiary, Recorded to APIC | 214,000,000 aes_GainonDispositionofStockinSubsidiaryRecordedtoAPIC / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member |  |  |  |  |
Taxes and transaction costs recognized in equity |  |  |  |  | 81,000,000 aes_Taxesandtransactioncostsrecognizedinequity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member |
Reduction of Retain Earnings for difference between Fair Value and book value of shares sold | 214,000,000 aes_ReductionofRetainEarningsfordifferencebetweenFairValueandbookvalueofsharessold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member |  |  |  |  |
IPALCO Enterprises, Inc. [Member] | Acquire additional shares through 2016 [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price |  |  | 349,000,000 aes_SaleAgreementBuyerOptionToPurchaseOwnershipInterestSalesPrice / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member / us-gaap_StatementScenarioAxis = aes_Acquireadditionalsharesthrough2016Member |  |  |
Investment Options, acquisition percentage |  |  | 17.65%aes_InvestmentOptionsacquisitionpercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_IPALCOEnterprisesInc.Member / us-gaap_StatementScenarioAxis = aes_Acquireadditionalsharesthrough2016Member |  |  |
Jordan [Member] |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  | 40.00%aes_DisposalGroupNotDiscontinuedOperationOwnershipInterestSold / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aes_JordanMember
Disposal Group Not Discontinued Operation Generation Capacity |  |  |  |  |  | 247 aes_DisposalGroupNotDiscontinuedOperationGenerationCapacity / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aes_JordanMember
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds |  |  |  |  |  | $ 30,000,000 us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aes_JordanMember

X
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