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Debt - Non-Recourse Debt Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |
Debt defaults at risk of causing cross default |  |  | 0 |  | 0 |
Loss on extinguishment of debt |  |  | $ (40) | $ (51) | $ (41) | $ (61)
Proceeds From Issuance Of Nonrecourse Debt |  |  |  |  | 1,913 | 2,581
IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | (2) |
Nonrecourse Debt [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Nonrecourse Debt |  |  |  |  | 475 |
Repayments of Long-term Debt |  |  |  |  | (470) |
Nonrecourse Debt [Member] | AES Southland [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Nonrecourse Debt | [1] |  |  |  | 283 |
Repayments of Long-term Debt |  |  |  |  | 0 |
Nonrecourse Debt [Member] | AES Tiete [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Nonrecourse Debt |  |  |  |  | 95 |
Repayments of Long-term Debt |  |  |  |  | (1) |
Nonrecourse Debt [Member] | DPL Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Nonrecourse Debt |  |  |  |  | 415 |
Repayments of Long-term Debt |  |  |  |  | 0 |
Nonrecourse Debt [Member] | Gener Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Nonrecourse Debt |  |  |  |  | 90 |
Repayments of Long-term Debt |  |  |  |  | (8) |
Nonrecourse Debt [Member] | Mong Duong Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Nonrecourse Debt |  |  |  |  | 150 |
Repayments of Long-term Debt |  |  |  |  | $ 0 |
3.95% Senior Notes due 2049 [Domain] | Senior Notes [Member] | DP&L [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt |  |  |  | $ 425 |  | $ 425
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.95% |  | 3.95%
Variable Rate [Domain] | Senior Notes [Member] | DP&L [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt |  |  |  | $ 445 |  | $ 445
Extinguishment of Debt, Amount |  |  |  |  |  | 435
4.35% Senior Notes due 2029 [Domain] | Senior Notes [Member] | DPL Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | (43)
Issued new debt |  |  |  | $ 400 |  | $ 400
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.35% |  | 4.35%
7.25% Senior Notes due 2021 [Domain] | Senior Notes [Member] | DPL Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt |  |  |  | $ 780 |  | $ 780
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.25% | 7.25% | 7.25% | 7.25%
Extinguishment of Debt, Amount |  |  |  |  |  | $ 400
4.125% Senior Notes due 2025 [Domain] | Senior Notes [Member] | DPL Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt |  |  | $ 415 |  | $ 415 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.125% |  | 4.125% |
4.25% Senior Notes due 2030 [Domain] | Senior Notes [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt |  |  | $ 475 |  | $ 475 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.25% |  | 4.25% |
3.45% Senior Notes due 2020 [Domain] | Senior Notes [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.45% |  | 3.45% |
Extinguishment of Debt, Amount |  |  |  |  | $ 405 |
65 Million Term Loan due 2020 [Domain] | Senior Notes [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | $ 65 |
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 1.75% Term Loan Due In 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 1.75% |
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 2.25% Senior Notes Due In 2029 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 2.25% |
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 4.15% Senior Notes Due In 2029 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  |  | 4.15% |
Corporate and Other [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ (37) |
Corporate and Other [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 350 |  |  |
Corporate and Other [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.00% |  | 4.00% |
Subsequent Event [Member] | 7.25% Senior Notes due 2021 [Domain] | Senior Notes [Member] | DPL Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount |  | $ 380 |  |  |  |
[1] | Issuances relate to the June 2017 long-term non-recourse debt financing to fund the Southland repowering construction projects.

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