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Debt (Non-recourse Debt Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 78 | $ 186 | $ 169
Restricted cash and debt service reserves |  |  |  |  |  | 370 | 587 |
Restricted net assets |  |  |  |  |  | 1,500 |  |
Finance Lease, Liability, Current |  |  |  |  |  | 6 | $ 4 |
AES Panama |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 16 |  |  |
Non-Recourse Debt | Brazil subsidiary [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of long-term debt | [1] |  |  |  |  | (382) |  |
Loss on extinguishment of debt | [1] |  |  |  |  | 27 |  |
Proceeds from Issuance of Debt | [1] |  |  |  |  | 412 |  |
Non-Recourse Debt | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of long-term debt |  | $ (95) |  |  |  |  |  |
Loss on extinguishment of debt |  | 0 |  |  |  |  |  |
Proceeds from Issuance of Debt |  | 95 |  |  |  |  |  |
Non-Recourse Debt | AES Clean Energy |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | 0 |  |
Loss on extinguishment of debt |  |  |  |  |  | 0 |  |
Proceeds from Issuance of Debt |  |  |  |  |  | $ 502 |  |
Non-Recourse Debt | AES Andres |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  | $ (274) |  |  |  |  |
Loss on extinguishment of debt |  |  | 14 |  |  |  |  |
Proceeds from Issuance of Debt |  |  | $ 300 |  |  |  |  |
Non-Recourse Debt | ANDES [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of long-term debt |  | (129) |  |  |  |  |  |
Loss on extinguishment of debt |  | 14 |  |  |  |  |  |
Proceeds from Issuance of Debt |  | $ 0 |  |  |  |  |  |
Nonrecourse [Member] | DPL Subsidiary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 34 |  |  |  |
Nonrecourse [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 2 |  |  |  |
Nonrecourse [Member] | Colon [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | 610 |  |  |
Nonrecourse [Member] | Changuinola [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | 171 |  |  |
Nonrecourse [Member] | AES Panama |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | 447 |  |  |
4.375% senior notes due 2030 [Member] | Senior Notes [Member] | AES Panama |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 1,400 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.375% |  |  |
Panama Term Loan due 2023 [Member] | Non-Recourse Debt | AES Panama |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 105 |  |  |
6.25% Senior Secured Facility Agreement due 2034 [Member] | Senior Notes [Member] | Cochrane Subsidiary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 485 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 6.25% |  |  |
7.25% Senior Notes due 2021 [Domain] | DPL Subsidiary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | $ 380 |  |  |  |
7.25% Senior Notes due 2021 [Domain] | Unsecured Debt [Member] | DPL Subsidiary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 7.25% |  |  |  |
4.125% senior secured notes due 2025 [Member] | Senior Notes [Member] | DPL Subsidiary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 415 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.125% |  |  |  |
4.25% senior secured notes due 2030 [Member] | Senior Notes [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 475 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.25% |  |  |  |
3.45% senior unsecured notes due 2020 [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | $ 405 |  |  |  |
3.45% senior unsecured notes due 2020 [Member] | Unsecured Debt [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.45% |  |  |  |
IPALCO term loan due 2020 [Member] | Non-Recourse Debt | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | $ 65 |  |  |  |
Senior Notes [Member] | Cochrane Subsidiary |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | $ 445 |  |  |
[1] | Repayments relate to Andres and DPP.

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