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Debt - Non-Recourse Debt Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Debt defaults at risk of causing cross default | 0 |  |  | 0 |  |
Loss on extinguishment of debt | $ 65 |  | $ 11 | $ 126 | $ 187 |
Nonrecourse Debt [Member] | AES Southland [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 0 |  |  |  |
Issued new debt |  | 535 |  |  |  |
Repayments of Long-term Debt |  | 0 |  |  |  |
Nonrecourse Debt [Member] | AES Tiete [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  | 11 |  |  |  |
Issued new debt |  | 550 |  |  |  |
Repayments of Long-term Debt |  | $ (450) |  |  |  |
Nonrecourse Debt [Member] | Alto Maipo [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 3 |  |
Issued new debt | 561 |  |  | 561 |  |
Repayments of Long-term Debt |  |  |  | (533) |  |
Nonrecourse Debt [Member] | DPL Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 43 |  |
Issued new debt | 825 |  |  | 825 |  |
Repayments of Long-term Debt |  |  |  | (835) |  |
Nonrecourse Debt [Member] | Gener Subsidiary [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 31 |  |
Issued new debt | 1,120 |  |  | 1,120 |  |
Repayments of Long-term Debt |  |  |  | (1,081) |  |
Nonrecourse Debt [Member] | Angamos [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 28 |  |
Issued new debt | 610 |  |  | 610 |  |
Repayments of Long-term Debt |  |  |  | (579) |  |
LIBOR 1.75% Term Loan Due In 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | 343 |  |
LIBOR 2.25% Senior Notes Due In 2029 [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt | $ 1,100 |  |  | $ 1,100 |  |
4.41% SPV Loan [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.41% |  |  | 4.41% |  |
7.18% SPV Loan [Member] [Member] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.18% |  |  | 7.18% |  |
4.0% Senior Notes Due 2021 [Domain] [Domain] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt |  |  |  |  |  | $ 500
3.95% Senior Notes due 2049 [Domain] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt | $ 425 |  |  | $ 425 |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.95% |  |  | 3.95% |  |
Variable Rate [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Extinguishment of Debt, Amount |  |  |  | $ 435 |  |
Variable Rate [Domain] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt | $ 445 |  |  | 445 |  |
4.35% Senior Notes due 2029 [Domain] | Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued new debt | $ 400 |  |  | $ 400 |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.35% |  |  | 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] |  |  |  |  |  |
Issued new debt | $ 780 |  |  | $ 780 |  |
Unsecured Debt [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.00%
Unsecured Debt [Member] | 7.25% Senior Notes due 2021 [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.25% |  |  | 7.25% |  |
Unsecured Debt [Member] | 7.25% Senior Notes due 2021 [Domain] | Nonrecourse Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 43 |  |
Senior Notes [Member] | LIBOR 4.15% Senior Notes Due In 2029 [Member] [Member] | Nonrecourse Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 31 |  |
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% |  |

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