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Investments In and Advances To Affiliates - Summary of Financial Information of Affiliates & Subsidiaries (Details) (USD $) | 12 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 11, 2014 | Jul. 02, 2014 | Jul. 01, 2014 | Dec. 31, 2014 | Oct. 13, 2014 | Sep. 30, 2014 | Sep. 30, 2014
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business | $ 358,000,000 us-gaap_GainLossOnSaleOfBusiness | $ 26,000,000 us-gaap_GainLossOnSaleOfBusiness | $ 219,000,000 us-gaap_GainLossOnSaleOfBusiness |  |  |  |  |  |  |
Other non-operating expense | 128,000,000 us-gaap_OtherNonoperatingExpense | 129,000,000 us-gaap_OtherNonoperatingExpense | 50,000,000 us-gaap_OtherNonoperatingExpense |  |  |  |  |  |  |
Payments to Acquire Businesses and Interest in Affiliates | 728,000,000 us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates | 7,000,000 us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates | 20,000,000 us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates |  |  |  |  |  |  |
Proceeds from the sale of businesses, net of cash sold | 1,807,000,000 us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates | 170,000,000 us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates | 639,000,000 us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates |  |  |  |  |  |  |
Net equity in earnings of affiliates | 19,000,000 us-gaap_IncomeLossFromEquityMethodInvestments | 25,000,000 us-gaap_IncomeLossFromEquityMethodInvestments | 35,000,000 us-gaap_IncomeLossFromEquityMethodInvestments |  |  |  |  |  |  |
Global Infrastructure Partners |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of businesses, net of cash sold |  |  |  | 730,000,000 us-gaap_ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = aes_GlobalInfrastructurePartnersMember |  |  |  |  |  |
Silver Ridge Power |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |  |  |  |
Equity Method Investment, Purchase Price Agreement |  |  |  |  | 179,000,000 aes_EquityMethodInvestmentPurchasePriceAgreement / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |  |  |  |
Investment In Affiliate Ownership Percentage | 0.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_SilverRidgePowerMember | 50.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |  |  |  | 0.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |  |
Other non-operating expense | 42,000,000 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_SilverRidgePowerMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_SilverRidgePowerMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment | 42,000,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |  |  |  |  |  |  |  |
Silver Ridge - Italy |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentAxis = aes_SilverRidgeItalyMember |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentAxis = aes_SilverRidgeItalyMember |  |  |
Equity Method Investment, Purchase Price Agreement |  |  |  |  |  | 42,000,000 aes_EquityMethodInvestmentPurchasePriceAgreement / invest_InvestmentAxis = aes_SilverRidgeItalyMember |  |  |  |
Silver Ridge- Italy and Spain |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity method Investment balance reclassed to Other noncurrent assets | 64,000,000 aes_EquitymethodInvestmentbalancereclassedtoOthernoncurrentassets / invest_InvestmentAxis = aes_SilverRidgeItalyandSpainMember |  |  |  |  |  | 64,000,000 aes_EquitymethodInvestmentbalancereclassedtoOthernoncurrentassets / invest_InvestmentAxis = aes_SilverRidgeItalyandSpainMember |  | 32,000,000 aes_EquitymethodInvestmentbalancereclassedtoOthernoncurrentassets / invest_InvestmentAxis = aes_SilverRidgeItalyandSpainMember | 32,000,000 aes_EquitymethodInvestmentbalancereclassedtoOthernoncurrentassets / invest_InvestmentAxis = aes_SilverRidgeItalyandSpainMember
Accumulated other comprehensive income reclassed to other noncurrent assets |  |  |  |  |  |  |  |  | 40,000,000 aes_Accumulatedothercomprehensiveincomereclassedtoothernoncurrentassets / invest_InvestmentAxis = aes_SilverRidgeItalyandSpainMember | 40,000,000 aes_Accumulatedothercomprehensiveincomereclassedtoothernoncurrentassets / invest_InvestmentAxis = aes_SilverRidgeItalyandSpainMember
Barry |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Investment In Affiliate Ownership Percentage | 100.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_BarryAffiliateMember | 100.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_BarryAffiliateMember |  |  |  |  | 100.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_BarryAffiliateMember |  |  |
Long Term Liabilities Associated With Debt Agreement Resulting In Loss Of Control | 52,000,000 aes_LongTermLiabilitiesAssociatedWithDebtAgreementResultingInLossOfControl / invest_InvestmentAxis = aes_BarryAffiliateMember | 55,000,000 aes_LongTermLiabilitiesAssociatedWithDebtAgreementResultingInLossOfControl / invest_InvestmentAxis = aes_BarryAffiliateMember |  |  |  |  | 52,000,000 aes_LongTermLiabilitiesAssociatedWithDebtAgreementResultingInLossOfControl / invest_InvestmentAxis = aes_BarryAffiliateMember |  |  |
Elsta |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentAxis = aes_ElstaMember |  |
Investment In Affiliate Ownership Percentage | 50.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_ElstaMember | 50.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_ElstaMember |  |  |  |  | 50.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_ElstaMember |  |  |
Impaired Long-Lived Assets Held and Used, Facts and Circumstances Leading to Impairment | 82,000,000 aes_ImpairmentofLongLivedAssetsRecognizedEquityAffiliateLevel / invest_InvestmentAxis = aes_ElstaMember |  |  |  |  |  |  |  |  |
Other non-operating expense | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ElstaMember | 129,000,000 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ElstaMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ElstaMember |  |  |  |  |  |  |
Net equity in earnings of affiliates | 41,000,000 us-gaap_IncomeLossFromEquityMethodInvestments / invest_InvestmentAxis = aes_ElstaMember |  |  |  |  |  | (41,000,000)us-gaap_IncomeLossFromEquityMethodInvestments / invest_InvestmentAxis = aes_ElstaMember |  |  |
Entek |  |  |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 49.62%us-gaap_EquityMethodInvestmentOwnershipPercentage / invest_InvestmentAxis = aes_EntekMember |  |
Equity Method Investment, Purchase Price Agreement |  |  |  |  |  |  |  | 125,000,000 aes_EquityMethodInvestmentPurchasePriceAgreement / invest_InvestmentAxis = aes_EntekMember | 125,000,000 aes_EquityMethodInvestmentPurchasePriceAgreement / invest_InvestmentAxis = aes_EntekMember |
Investment In Affiliate Ownership Percentage | 0.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_EntekMember | 50.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_EntekMember |  |  |  |  | 0.00%aes_InvestmentInAffiliateOwnershipPercentage / invest_InvestmentAxis = aes_EntekMember |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  |  | 4,000,000 us-gaap_GainLossOnSaleOfBusiness / invest_InvestmentAxis = aes_EntekMember |  |  |
Other non-operating expense | 86,000,000 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_EntekMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_EntekMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_EntekMember |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  |  | $ 68,000,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_EntekMember | $ 86,000,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_EntekMember | $ 18,000,000 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_EntekMember

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569 + Details
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