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Income Taxes (Income Tax Payables and Income Tax Receivables) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014 tax_system	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Number of Chilean Income Tax Systems	2aes_NumberofChileanIncomeTaxSystems
Income taxes receivable—current	$ 217us-gaap_IncomeTaxesReceivable	$ 206us-gaap_IncomeTaxesReceivable
Total income taxes receivable	217us-gaap_IncomeTaxReceivable	206us-gaap_IncomeTaxReceivable
Income taxes payable—current	299us-gaap_AccruedIncomeTaxesCurrent	322us-gaap_AccruedIncomeTaxesCurrent
Income taxes payable—noncurrent	2us-gaap_AccruedIncomeTaxesNoncurrent	2us-gaap_AccruedIncomeTaxesNoncurrent
Total income taxes payable	$ 301us-gaap_AccruedIncomeTaxes	$ 324us-gaap_AccruedIncomeTaxes

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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- Definition

Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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