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Debt (Non-recourse Debt Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Construction line of credit facility remaining borrowing capacity | $ 1,900,000,000 |  |
Other line of credit remaining borrowing capacity | 2,300,000,000 |  |
Loss on extinguishment of debt | 13,000,000 | $ 182,000,000 | $ 261,000,000
Restricted cash and debt service reserves | 535,000,000 | $ 513,000,000 |
Restricted net assets | 2,500,000,000 |  |
Non-Recourse Debt |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 3,028,000,000 |  |
Repayments of long-term debt | (2,626,000,000) |  |
Loss on extinguishment of debt | 0 |  |
Non-Recourse Debt | Gener Subsidiary [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 633,000,000 |  |
Repayments of long-term debt | (314,000,000) |  |
Loss on extinguishment of debt | 7,000,000 |  |
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 688,000,000 |  |
Repayments of long-term debt | (455,000,000) |  |
Loss on extinguishment of debt | 0 |  |
Non-Recourse Debt | DPL Subsidiary |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 460,000,000 |  |
Repayments of long-term debt | (593,000,000) |  |
Loss on extinguishment of debt | (3,000,000) |  |
Non-Recourse Debt | Andres [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 243,000,000 |  |
Repayments of long-term debt | (180,000,000) |  |
Loss on extinguishment of debt | (2,000,000) |  |
Non-Recourse Debt | Los Mina [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 172,000,000 |  |
Repayments of long-term debt | 0 |  |
Loss on extinguishment of debt | 0 |  |
Non-Recourse Debt | Eletropaulo [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 73,000,000 |  |
Repayments of long-term debt | (202,000,000) |  |
Loss on extinguishment of debt | 0 |  |
Non-Recourse Debt | Wind Generation Holdings [Domain] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 130,000,000 |  |
Repayments of long-term debt | (65,000,000) |  |
Loss on extinguishment of debt | 0 |  |
Non-Recourse Debt | Maritza [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 18,000,000 |  |
Repayments of long-term debt | (153,000,000) |  |
Loss on extinguishment of debt | 0 |  |
Non-Recourse Debt | Other Subsidiaries [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt face amount | 611,000,000 |  |
Repayments of long-term debt | (664,000,000) |  |
Loss on extinguishment of debt | $ (2,000,000) |  |

X
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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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