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Equity (Transactions with Noncontrolling Interests) (Details) (USD $)
3 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Jul. 15, 2014
Jun. 30, 2014
Dec. 15, 2014
Jun. 25, 2014
Noncontrolling Interest [Line Items]                
Net increase in The AES Corporation's paid-in capital for sale of subsidiary shares $ 130,000,000us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest $ 29,000,000us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest $ 16,000,000us-gaap_NoncontrollingInterestIncreaseFromSaleOfParentEquityInterest          
Acquire addition shares through December 31, 2015                
Noncontrolling Interest [Line Items]                
Investment Options, acquisition percentage       2.00%aes_InvestmentOptionsacquisitionpercentage
/ aes_DominicanRepublicadditionalinvestmentoptionsAxis
= aes_AcquireadditionsharesthroughDecember312015Member
       
Acquire additional shares through December 31, 2016                
Noncontrolling Interest [Line Items]                
Investment Options, acquisition percentage       10.00%aes_InvestmentOptionsacquisitionpercentage
/ aes_DominicanRepublicadditionalinvestmentoptionsAxis
= aes_AcquireadditionalsharesthroughDecember312016Member
       
Dominican Republic                
Noncontrolling Interest [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 8.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= aes_DominicanRepublicMember
8.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= aes_DominicanRepublicMember
           
Proceeds from divestiture of business       84,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ dei_LegalEntityAxis
= aes_DominicanRepublicMember
       
Gain on Disposition of Stock in Subsidiary, Recorded to APIC 29,000,000aes_GainonDispositionofStockinSubsidiaryRecordedtoAPIC
/ dei_LegalEntityAxis
= aes_DominicanRepublicMember
             
AES US Investment, Inc.                
Noncontrolling Interest [Line Items]                
Investment In Affiliate Ownership Percentage Sold 15.00%aes_InvestmentInAffiliateOwnershipPercentageSold
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_AESUSInvestmentInc.Member
15.00%aes_InvestmentInAffiliateOwnershipPercentageSold
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_AESUSInvestmentInc.Member
           
Divestiture of Business, Purchase Purchase Subject Adjustment             247,000,000aes_DivestitureofBusinessPurchasePurchaseSubjectAdjustment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_AESUSInvestmentInc.Member
 
Masinloc Subsidiary                
Noncontrolling Interest [Line Items]                
Proceeds from divestiture of business         436,000,000us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_MasinlocSubsidiaryMember
     
Investment In Affiliate Ownership Percentage Sold               45.00%aes_InvestmentInAffiliateOwnershipPercentageSold
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_MasinlocSubsidiaryMember
Divestiture of Business, Purchase Purchase Subject Adjustment               453,000,000aes_DivestitureofBusinessPurchasePurchaseSubjectAdjustment
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_MasinlocSubsidiaryMember
Divestiture of Businesses, Portion Contingent Upon Achievement of Certain Restructuring Efficiencies         23,000,000aes_DivestitureofBusinessesPortionContingentUponAchievementofCertainRestructuringEfficiencies
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_MasinlocSubsidiaryMember
     
Noncontrolling Interest, Ownership Percentage by Parent         51.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_MasinlocSubsidiaryMember
     
Masinloc Subsidiary | Electricity Generating Public Company Limited                
Noncontrolling Interest [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         41.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= aes_ElectricityGeneratingPublicCompanyLimitedMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_MasinlocSubsidiaryMember
     
Masinloc Subsidiary | International Finance Corporation                
Noncontrolling Interest [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         8.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ dei_LegalEntityAxis
= aes_InternationalFinanceCorporationMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_MasinlocSubsidiaryMember
     
IPALCO Enterprises, Inc. [Member]                
Noncontrolling Interest [Line Items]                
Noncontrolling Interest, Ownership Percentage by Parent 100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_IPALCOEnterprisesInc.Member
100.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= aes_IPALCOEnterprisesInc.Member
           
Masinloc Subsidiary                
Noncontrolling Interest [Line Items]                
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal           283,000,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aes_MasinlocSubsidiaryMember
   
Acquire additional shares through 2016                
Noncontrolling Interest [Line Items]                
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners 30.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ aes_AESUSInvestmentInc.AdditionalInvestmentOptionsAxis
= aes_Acquireadditionalsharesthrough2016Member
30.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ aes_AESUSInvestmentInc.AdditionalInvestmentOptionsAxis
= aes_Acquireadditionalsharesthrough2016Member
           
Investment Options, acquisition percentage 17.65%aes_InvestmentOptionsacquisitionpercentage
/ aes_AESUSInvestmentInc.AdditionalInvestmentOptionsAxis
= aes_Acquireadditionalsharesthrough2016Member
             
Guacolda | Gener Subsidiary                
Noncontrolling Interest [Line Items]                
Equity Method Investment, Ownership Percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentAxis
= aes_GuacoldaAffiliateMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= aes_GenerSubsidiaryMember
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentAxis
= aes_GuacoldaAffiliateMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= aes_GenerSubsidiaryMember
           
Acquire additional shares through 2016 | IPALCO Enterprises, Inc. [Member]                
Noncontrolling Interest [Line Items]                
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price 349,000,000aes_SaleAgreementBuyerOptionToPurchaseOwnershipInterestSalesPrice
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aes_IPALCOEnterprisesInc.Member
/ us-gaap_StatementScenarioAxis
= aes_Acquireadditionalsharesthrough2016Member
             
Acquire addition shares through December 31, 2015 | Dominican Republic                
Noncontrolling Interest [Line Items]                
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price       24,000,000aes_SaleAgreementBuyerOptionToPurchaseOwnershipInterestSalesPrice
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aes_DominicanRepublicMember
/ us-gaap_StatementScenarioAxis
= aes_AcquireadditionsharesthroughDecember312015Member
       
Acquire additional shares through December 31, 2016 | Dominican Republic                
Noncontrolling Interest [Line Items]                
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price       125,000,000aes_SaleAgreementBuyerOptionToPurchaseOwnershipInterestSalesPrice
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= aes_DominicanRepublicMember
/ us-gaap_StatementScenarioAxis
= aes_AcquireadditionalsharesthroughDecember312016Member