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Acquisitions and Dispositions (Details) (USD $) | 0 Months Ended | 3 Months Ended | 5 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 10, 2013 Trinidad Generation Unlimited | Apr. 26, 2013 AES Cartagena MW | Jun. 30, 2013 AES Cartagena | Jul. 31, 2013 AES Cartagena | Dec. 31, 2012 AES Cartagena | Jun. 30, 2012 InnoVent and St. Patrick | Dec. 31, 2012 China Wind | Dec. 31, 2011 DPL Acquisition
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Percentage of voting interest acquired |  |  |  |  |  |  |  | 100.00%
Business acquisition purchase price |  |  |  |  |  |  |  | $ 3,500,000,000
Dispositions |  |  |  |  |  |  |  |
Equity method investment, ownership percentage sold | 10.00% |  |  |  |  |  |  |
Proceeds from the sale of equity method investments | 31,000,000 |  |  |  |  |  |  |
Equity method investment | 28,000,000 |  |  |  |  |  |  |
Equity method investment, gain (loss) on disposal | 3,000,000 |  |  |  |  |  |  |
Cartagena generation capacity (MW) |  | 1,199 |  |  |  |  |  |
Proceeds from sale of ownership interest in Cartagena |  | 24,000,000 |  |  |  |  |  |
Pre-tax gain on disposal |  |  | 20,000,000 |  | 178,000,000 |  |  |
Cartagena ownership interest sold |  |  |  |  | 80.00% |  |  |
Cartagena ownership interest prior to sale |  |  |  |  | 70.81% |  |  |
Acquirer's option to purchase additional ownership interest in Cartagena |  |  |  |  | 20.00% |  |  |
Term of buyer option to purchase Company's remaining interest |  |  |  | 5 months |  |  |  |
Company's continuing ownership interest extension period (beyond one year) |  |  |  |  | 1 year |  |  |
Proceeds from the sale of interest in affiliate |  |  |  |  |  | 42,000,000 |  |
Proceeds from sale of China equity method investments |  |  |  |  |  |  | 133,000,000 |
Gain on sale of China equity method investments |  |  |  |  |  |  | $ 27,000,000 |

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