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Debt (Non-recourse Debt Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017 | Feb. 28, 2017
Debt Instrument [Line Items] |  |  |  |  |
Construction line of credit facility remaining borrowing capacity | $ 1,800,000,000 |  |  |  |
Other line of credit remaining borrowing capacity | 1,700,000,000 |  |  |  |
Loss on extinguishment of debt | 68,000,000 | $ 13,000,000 | $ 182,000,000 |  |
Restricted cash and debt service reserves | 642,000,000 | $ 535,000,000 |  |  |
Restricted net assets | 2,800,000,000 |  |  |  |
Non-Recourse Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 3,508,000,000 |  |  |  |
Repayments of long-term debt | (2,550,000,000) |  |  |  |
Loss on extinguishment of debt | 23,000,000 |  |  |  |
Non-Recourse Debt | AES Tiete [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 585,000,000 |  |  |  |
Repayments of long-term debt | (293,000,000) |  |  |  |
Loss on extinguishment of debt | (5,000,000) |  |  |  |
Non-Recourse Debt | Gener Subsidiary [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 335,000,000 |  |  |  |
Repayments of long-term debt | (426,000,000) |  |  |  |
Loss on extinguishment of debt | (20,000,000) |  |  |  |
Non-Recourse Debt | AES Argentina [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 310,000,000 |  |  |  | $ 75,000,000
Repayments of long-term debt | (181,000,000) |  |  |  |
Loss on extinguishment of debt | 65,000,000 |  |  |  |
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 608,000,000 |  |  |  |
Repayments of long-term debt | (528,000,000) |  |  |  |
Loss on extinguishment of debt | (9,000,000) |  |  |  |
Non-Recourse Debt | AES Southland [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 557,000,000 |  |  | $ 1,967,000,000 |
Repayments of long-term debt | 0 |  |  |  |
Loss on extinguishment of debt | 0 |  |  |  |
Non-Recourse Debt | DPL Subsidiary |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 103,000,000 |  |  |  |
Repayments of long-term debt | (249,000,000) |  |  |  |
Loss on extinguishment of debt | (3,000,000) |  |  |  |
Non-Recourse Debt | Masinloc Subsidiary [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 160,000,000 |  |  |  |
Repayments of long-term debt | (51,000,000) |  |  |  |
Loss on extinguishment of debt | 0 |  |  |  |
Non-Recourse Debt | MCAC |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 262,000,000 |  |  |  |
Repayments of long-term debt | 0 |  |  |  |
Loss on extinguishment of debt | 0 |  |  |  |
Non-Recourse Debt | Los Mina [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 303,000,000 |  |  |  |
Repayments of long-term debt | (275,000,000) |  |  |  |
Loss on extinguishment of debt | (4,000,000) |  |  |  |
Non-Recourse Debt | Other Subsidiaries [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 285,000,000 |  |  |  |
Repayments of long-term debt | (547,000,000) |  |  |  |
Loss on extinguishment of debt | $ (1,000,000) |  |  |  |

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