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Debt (Non-recourse Debt Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |  |
Construction line of credit facility remaining borrowing capacity | $ 2,600,000,000 |  |
Other line of credit remaining borrowing capacity | 2,400,000,000 |  |
Loss on extinguishment of debt | 186,000,000 | $ 261,000,000 | $ 229,000,000
Restricted cash and debt service reserves | 513,000,000 | 245,000,000 |
Restricted net assets | 2,000,000,000 |  |
Increase (Decrease) in Interest Expense, Debt | (64,000,000) | $ (48,000,000) | $ (34,000,000)
Non-Recourse Debt | Construction Loans |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 123,000,000 |  |
Non-Recourse Debt | Mong Duong Subsidiary | Construction Loans |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 203,000,000 |  |
Non-Recourse Debt | Gener Subsidiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 1,100,000,000 |  |
Repayments of long-term debt | 423,000,000 |  |
Loss on extinguishment of debt | 19,000,000 |  |
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 847,000,000 |  |
Repayments of long-term debt | 602,000,000 |  |
Loss on extinguishment of debt | 22,000,000 |  |
Non-Recourse Debt | Electropaulo |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 354,000,000 |  |
Repayments of long-term debt | 211,000,000 |  |
Non-Recourse Debt | DPL Subsidiary |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 325,000,000 |  |
Repayments of long-term debt | 475,000,000 |  |
Loss on extinguishment of debt | 2,000,000 |  |
Non-Recourse Debt | PANAMA |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 300,000,000 |  |
Repayments of long-term debt | 287,000,000 |  |
Loss on extinguishment of debt | 15,000,000 |  |
Non-Recourse Debt | Tiete Subsidiary |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 153,000,000 |  |
Repayments of long-term debt | 226,000,000 |  |
Non-Recourse Debt | Sul Subsidiary |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 513,000,000 |  |
Repayments of long-term debt | 486,000,000 |  |
Loss on extinguishment of debt | 4,000,000 |  |
Non-Recourse Debt | Andres [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 180,000,000 |  |
Repayments of long-term debt | 176,000,000 |  |
Loss on extinguishment of debt | 11,000,000 |  |
Non-Recourse Debt | Itabo (San Lorenzo) [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Loss on extinguishment of debt | $ 8,000,000 |  |

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- Definition Amount of borrowing capacity currently available under credit facilities at subsidiaries with facilities under construction (current borrowing capacity less the amount of borrowings outstanding) to fund construction and other related costs + References No definition available. + Details
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- Definition Amount of borrowing capacity currently available under credit facilities at subsidiaries (current borrowing capacity less the amount of borrowings outstanding) for general business use, including to support working capital, debt service reserves and other business needs excluding construction + References No definition available. + Details
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