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Debt - Non-Recourse Debt Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Debt defaults at risk of causing cross default | 0 |  |  | 0 |  |
Loss on extinguishment of debt | $ 51 |  | $ 6 | $ 61 | $ 176 |
Nonrecourse Debt [Member] | AES Southland [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 11 |  |  |  |
Issued new debt |  | 550 |  |  |  |
Repayments of Long-term Debt |  | (450) |  |  |  |
Nonrecourse Debt [Member] | AES Tiete [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  | 0 |  |  |  |
Issued new debt |  | 252 |  |  |  |
Repayments of Long-term Debt |  | $ 0 |  |  |  |
Nonrecourse Debt [Member] | Alto Maipo [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 3 |  |
Issued new debt | 574 |  |  | 574 |  |
Repayments of Long-term Debt |  |  |  | (553) |  |
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) |  |
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 |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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