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Other Non-Operating Expense - Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended |
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Dec. 31, 2014 MW | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 13, 2014 | Sep. 30, 2014 MW | Dec. 31, 2014 | Sep. 30, 2014 MW | Jul. 02, 2014 | Mar. 31, 2012 | Jun. 25, 2014
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business | $ 358 us-gaap_GainLossOnSaleOfBusiness | $ 26 us-gaap_GainLossOnSaleOfBusiness | $ 219 us-gaap_GainLossOnSaleOfBusiness |  |  |  |  |  |  |
Production Capacity (MW) | 2,072 aes_GenerationCapacityMegaWatts |  |  |  |  | 2,072 aes_GenerationCapacityMegaWatts |  |  |  |
Other Nonoperating Expense | 128 us-gaap_OtherNonoperatingExpense | 129 us-gaap_OtherNonoperatingExpense | 50 us-gaap_OtherNonoperatingExpense |  |  |  |  |  |  |
Entek |  |  |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  | 4 us-gaap_GainLossOnSaleOfBusiness / invest_InvestmentAxis = aes_EntekMember |  |  |  |
Investment In Affiliate Ownership Percentage Sold |  |  |  |  | 49.62%aes_InvestmentInAffiliateOwnershipPercentageSold / invest_InvestmentAxis = aes_EntekMember |  | 49.62%aes_InvestmentInAffiliateOwnershipPercentageSold / invest_InvestmentAxis = aes_EntekMember |  |  |
Equity Method Investment, Purchase Price Agreement |  |  |  | 125 aes_EquityMethodInvestmentPurchasePriceAgreement / invest_InvestmentAxis = aes_EntekMember | 125 aes_EquityMethodInvestmentPurchasePriceAgreement / invest_InvestmentAxis = aes_EntekMember |  |  |  |  |
Production Capacity (MW) |  |  |  |  | 364 aes_GenerationCapacityMegaWatts / invest_InvestmentAxis = aes_EntekMember |  | 364 aes_GenerationCapacityMegaWatts / invest_InvestmentAxis = aes_EntekMember |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  | 68 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_EntekMember | 86 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_EntekMember |  | 18 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_EntekMember |  |  |
Other Nonoperating Expense | 86 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_EntekMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_EntekMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_EntekMember |  |  |  |  |  |  |
Silver Ridge Power |  |  |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Purchase Price Agreement |  |  |  |  |  |  |  | 179 aes_EquityMethodInvestmentPurchasePriceAgreement / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |
Equity Method Investment, Other than Temporary Impairment | 42 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold |  |  |  |  |  |  |  | 50.00%aes_EquityMethodInvestmentOwnershipPercentageSold / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |
Equity Method Investment, Net Sales Proceeds |  |  |  |  |  |  |  | 179 us-gaap_EquityMethodInvestmentNetSalesProceeds / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |
Other Nonoperating Expense | 42 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_SilverRidgePowerMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_SilverRidgePowerMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_SilverRidgePowerMember |  |  |  |  |  |  |
Elsta |  |  |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |  |  |  |  |
Production Capacity (MW) |  | 630 aes_GenerationCapacityMegaWatts / invest_InvestmentAxis = aes_ElstaMember |  |  |  |  |  |  |  |
Other Nonoperating Expense | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ElstaMember | 129 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ElstaMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ElstaMember |  |  |  |  |  |  |
Equity Method Investments |  | 240 us-gaap_EquityMethodInvestments / invest_InvestmentAxis = aes_ElstaMember |  |  |  |  |  |  |  |
Equity Method Investments, Fair Value Disclosure |  | 111 us-gaap_EquityMethodInvestmentsFairValueDisclosure / invest_InvestmentAxis = aes_ElstaMember |  |  |  |  |  |  |  |
China generation and wind |  |  |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  |  |  | 32 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_ChinaGenerationMember |
Other Nonoperating Expense | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ChinaGenerationMember | 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ChinaGenerationMember | 32 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_ChinaGenerationMember |  |  |  |  |  |  |
InnoVent |  |  |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  |  |  |  | 17 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment / invest_InvestmentAxis = aes_InnoventMember |
Other Nonoperating Expense | $ 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_InnoventMember | $ 0 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_InnoventMember | $ 17 us-gaap_OtherNonoperatingExpense / invest_InvestmentAxis = aes_InnoventMember |  |  |  |  |  |  |
Masinloc Subsidiary |  |  |  |  |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |  |  |  |  |
Investment In Affiliate Ownership Percentage Sold |  |  |  |  |  |  |  |  |  | 45.00%aes_InvestmentInAffiliateOwnershipPercentageSold / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = aes_MasinlocSubsidiaryMember

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