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Subsequent Events (Details) (subsequent event) In Millions, unless otherwise specified | Oct. 03, 2012 AES IC Ictas JV [Member] XAF | Oct. 05, 2012 Tisza II [Member] USD ($)
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Subsequent Event [Line Items] |  |
Ownership interest in hydro projects | 100.00% |
Net Proceeds From Joint Venture Split | 10 |
Gain on Joint Venture Split | 11 |
Proceeds To Be Received From Joint Venture Split | 85 |
Ownership Interest Percent To Be Sold | 50.40% |
Sale price of asset group |  | 17
Carrying amount of asset group |  | 35
Cumulative translation losses excluded from carrying amount |  | 73
Estimated pretax loss on sale of asset group |  | $ 91

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