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Debt (Non-recourse Debt Narrative) (Details) - USD ($) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 01, 2017 | Feb. 28, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Materiality threshold for cash distribution from business to Parent |  |  | 20.00% |  |  |  |
Construction line of credit facility remaining borrowing capacity |  |  | $ 811,000,000 |  |  |  |
Other line of credit remaining borrowing capacity |  |  | 1,800,000,000 |  |  |  |
Loss on extinguishment of debt |  |  | 188,000,000 | $ 68,000,000 | $ 13,000,000 |  |
Restricted cash and debt service reserves |  |  | 627,000,000 | 642,000,000 |  |  |
Restricted net assets |  |  | 2,900,000,000 |  |  |  |
Non-Recourse Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | 1,351,000,000 |  |  |  |
Repayments of long-term debt |  |  | (628,000,000) |  |  |  |
Loss on extinguishment of debt |  |  | (13,000,000) |  |  |  |
Non-Recourse Debt | AES Tiete [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | 385,000,000 |  |  |  |
Repayments of long-term debt |  |  | (231,000,000) |  |  |  |
Loss on extinguishment of debt |  |  | 0 |  |  |  |
Non-Recourse Debt | Gener Subsidiary [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | 0 |  |  |  |
Repayments of long-term debt |  |  | (106,000,000) |  |  |  |
Loss on extinguishment of debt |  |  | 6,000,000 |  |  |  |
Non-Recourse Debt | AES Argentina [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | 0 |  |  |  | $ 75,000,000
Repayments of long-term debt |  |  | (104,000,000) |  |  |  |
Loss on extinguishment of debt |  |  | 7,000,000 |  |  |  |
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount | [1] |  | 757,000,000 |  |  |  |
Repayments of long-term debt |  |  | 0 |  |  |  |
Loss on extinguishment of debt |  |  | 0 |  |  |  |
Non-Recourse Debt | AES Southland [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | 104,000,000 |  |  |  |
Repayments of long-term debt |  |  | 0 |  |  |  |
Loss on extinguishment of debt |  |  | 0 |  |  |  |
Non-Recourse Debt | MCAC |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | 105,000,000 |  |  |  |
Repayments of long-term debt |  |  | (89,000,000) |  |  |  |
Loss on extinguishment of debt |  |  | 0 |  |  |  |
Non-Recourse Debt | Los Mina [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | 0 |  |  |  |
Repayments of long-term debt |  |  | (98,000,000) |  |  |  |
Loss on extinguishment of debt |  |  | $ 0 |  |  |  |
Unsecured Debt [Member] | AES Argentina [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ (65,000,000) |  |  |
5.125% Senior Notes Due 2017 [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  | $ 500,000,000 |  |  |  |  |
5.125% Senior Notes Due 2027 [Member] | Unsecured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.125% |
8.0% Senior Notes Due 2020 [Domain] | Unsecured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% | 8.00% |  |  | 8.00% |
Loss on extinguishment of debt |  | $ 47,000,000 |  |  |  |  |
4.5% Senior Notes Due 2023 [Domain] [Domain] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | $ 500,000,000 |  |  |  |
4.5% Senior Notes Due 2023 [Domain] [Domain] | Unsecured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.50% |  |  |  |
4.0% Senior Notes Due 2021 [Domain] [Domain] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt face amount |  |  | $ 500,000,000 |  |  |  |
4.0% Senior Notes Due 2021 [Domain] [Domain] | Unsecured Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |  |  |  |
[1] | Issuances relate to the June 2017, long-term non-recourse debt financing to fund the Southland re-powering construction projects.

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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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