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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
--- | --- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Finance Lease, Liability, Current |  | $ 3 |  |  |  |  | $ 3 |  |
Materiality threshold for cash distribution from business to Parent |  | 20.00% |  |  |  |  | 20.00% |  |
Construction line of credit facility remaining borrowing capacity |  | $ 470 |  |  |  |  | $ 470 |  |
Other line of credit remaining borrowing capacity |  | 1,100 |  |  |  |  | 1,100 |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 169 | $ 188 | $ 68
Restricted cash and debt service reserves |  | 372 |  |  |  |  | 372 | $ 627 |
Restricted net assets |  | 1,200 |  |  |  |  | 1,200 |  |
Finance Lease, Liability, Noncurrent |  | 67 |  |  |  |  | 67 |  |
Non-Recourse Debt | Gener Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  | 1,000 |  |  |  |  | 1,000 |  |
Repayments of long-term debt |  |  |  |  |  |  | (697) |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 29 |  |
Non-Recourse Debt | AES Southland [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount | [1] | 930 |  |  |  |  | 930 |  |
Repayments of long-term debt |  |  |  |  |  |  | (210) |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 1 |  |
Non-Recourse Debt | DPL Subsidiary |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount | [2] |  |  |  | $ 825 |  |  |  |
Repayments of long-term debt | [2] |  |  |  | (835) |  |  |  |
Loss on extinguishment of debt | [2] |  |  |  | 43 |  |  |  |
Non-Recourse Debt | AES Tiete [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | 561 |  |  |  |
Repayments of long-term debt |  |  |  |  | (533) |  |  |  |
Loss on extinguishment of debt |  |  |  |  | 3 |  |  |  |
Non-Recourse Debt | Cochrane Subsidiary |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  | 875 |  |  |  |  | 875 |  |
Repayments of long-term debt |  |  |  |  |  |  | (833) |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 24 |  |
Non-Recourse Debt | TEGTEP Mexico Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  | 280 |  |  |  |  | 280 |  |
Repayments of long-term debt |  |  |  |  |  |  | (248) |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 1 |  |
Non-Recourse Debt | Mong Duong Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount | [3] |  |  |  |  | $ 1,120 |  |  |
Repayments of long-term debt | [3] |  |  |  |  | (1,081) |  |  |
Loss on extinguishment of debt | [3] |  |  |  |  | 31 |  |  |
Non-Recourse Debt | Colon [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | 610 |  |  |
Repayments of long-term debt |  |  |  |  |  | (579) |  |  |
Loss on extinguishment of debt |  |  |  |  |  | 28 |  |  |
3.95% Senior Notes due 2049 [Domain] | Senior Notes [Member] | DP&L [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 425 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 3.95% |  |  |  |
LIBOR 2.25% Senior Notes Due In 2029 [Member] | Senior Notes [Member] | Mong Duong Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  | $ 1,100 |  |  |
5.125% Senior Notes Due 2027 [Member] | Senior Notes [Member] | Cochrane Subsidiary |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 430 |  |  |  |  | $ 430 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.50% |  |  |  |  | 5.50% |  |
6.25% Senior Secured Facility Agreement due 2034 [Member] | Credit Facility [Domain] | Cochrane Subsidiary |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 445 |  |  |  |  | $ 445 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.25% |  |  |  |  | 6.25% |  |
8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | $ 228 |  |  |  |  |
8.0% Senior Notes Due 2020 [Domain] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.00% |  |  |  |  |
4.5% Senior Notes Due 2023 [Domain] [Domain] | Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  | $ 500 |  |  |  |  |
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 |  |  |  |  |
4.0% Senior Notes Due 2021 [Domain] [Domain] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.00% |  |  |  |  |
4.41% SPV Loan [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.41% |  |  |
7.18% SPV Loan [Member] [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 7.18% |  |  |
LIBOR 4.15% Senior Notes Due In 2029 [Member] [Member] | Senior Notes [Member] | Non-Recourse Debt | Mong Duong Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  | $ 31 |  |  |
Variable Rate [Domain] | Cochrane Subsidiary |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  |  |  | $ 833 |  |
Variable Rate [Domain] | DP&L [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | $ 435 |  |  |  |
Variable Rate [Domain] | Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | 445 |  |  |  |
Variable Rate [Domain] | Senior Notes [Member] | Gener Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | (29) |  |
Variable Rate [Domain] | Senior Notes [Member] | Cochrane Subsidiary |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | (24) |  |
7.125% Senior Unsecured Notes due 2079 [Member] | Senior Notes [Member] | Gener Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  | $ 550 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.125% |  |  |  |  |  |
8.35% Senior Unsecured Notes due 2073 [Member] | Gener Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.375% |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  | $ 450 |  |  |  |  |  |
6.35% Senior Unsecured Notes due 2079 [Member] | Senior Notes [Member] | Gener Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 450 |  |  |  |  | $ 450 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.35% |  |  |  |  | 6.35% |  |
Senior unsecured notes due 2021 [Member] | Gener Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | $ 73 |  |  |  |  | $ 119 |  |
Senior unsecured notes due 2025 [Member] | Gener Subsidiary [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | $ 55 |  |  |  |  |  |  |
4.35% Senior Notes due 2029 [Domain] | Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 400 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.35% |  |  |  |
7.25% Senior Notes due 2021 [Domain] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  |  | $ 400 |  |  |  |
7.25% Senior Notes due 2021 [Domain] | Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  | $ 780 |  |  |  |
7.25% Senior Notes due 2021 [Domain] | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 7.25% |  |  |  |
7.25% Senior Notes due 2021 [Domain] | Unsecured Debt [Member] | Non-Recourse Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | $ 43 |  |  |  |
[1] | Issuances relate to the June 2017 long-term non-recourse debt financing to fund the Southland re-powering construction projects, a non-recourse bridge loan in September 2019, and long-term non-recourse debt financing issued in December 2019 to settle the bridge loan.
[2] | Includes transactions at DPL and its subsidiary, DP&L.
[3] | Non-cash transaction via an equity affiliate. See below for further information.

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