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Debt - Non-Recourse Debt Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt defaults at risk of causing cross default |  | 0 |  | 0 |  |  |
Loss on extinguishment of debt |  | $ (49,000,000) | $ (16,000,000) | $ (44,000,000) | $ (12,000,000) |  |
Proceeds from Issuance of Debt | $ 75,000,000 |  |  |  |  |  |
AES Southland [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Issued new debt |  |  |  |  |  | $ 2,000,000,000 |
Senior Notes [Member] | AES Southland [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% |  | 4.50% |  |  |
Nonrecourse Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ 44,000,000 |  |  |
Issued new debt |  | $ 2,975,000,000 |  | 2,975,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | (1,947,000,000) |  |  |
Nonrecourse Debt [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 9,000,000 |  |  |
Issued new debt |  | 532,000,000 |  | 532,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | (480,000,000) |  |  |
Nonrecourse Debt [Member] | Eletropaulo [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 0 |  |  |
Issued new debt |  | 189,000,000 |  | 189,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | (147,000,000) |  |  |
Nonrecourse Debt [Member] | MCAC - Generation [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 0 |  |  |
Issued new debt |  | 220,000,000 |  | 220,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | 0 |  |  |
Nonrecourse Debt [Member] | AES Southland [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 0 |  |  |
Issued new debt |  | 360,000,000 |  | 360,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | 0 |  |  |
Nonrecourse Debt [Member] | AES Tiete [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 5,000,000 |  |  |
Issued new debt |  | 585,000,000 |  | 585,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | (293,000,000) |  |  |
Nonrecourse Debt [Member] | Andes - Generation [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 65,000,000 |  |  |
Issued new debt |  | 307,000,000 |  | 307,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | (181,000,000) |  |  |
Nonrecourse Debt [Member] | Los Mina [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 4,000,000 |  |  |
Issued new debt |  | 278,000,000 |  | 278,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | (259,000,000) |  |  |
Nonrecourse Debt [Member] | Other Subsidiaries [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | (3,000,000) |  |  |
Issued new debt |  | 261,000,000 |  | 261,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | (509,000,000) |  |  |
Nonrecourse Debt [Member] | Gener Subsidiary [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | 0 |  |  |
Issued new debt |  | $ 243,000,000 |  | 243,000,000 |  |  |
Repayments of Long-term Debt |  |  |  | $ (78,000,000) |  |  |
Senior Secured Note through 2040 [Member] | AES Southland [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Issued new debt |  |  |  |  |  | 1,500,000,000 |
Senior Secured Term Loan through 2027 [Member] | AES Southland [Domain] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Issued new debt |  |  |  |  |  | $ 500,000,000 |
7.75% Senior Notes Due 2024 [Member] | Nonrecourse Debt [Member] | Andes - Generation [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Issued new debt |  |  |  |  |  |  | $ 300,000,000

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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