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Redeemable Stocks of Subsidiaries (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  |  | $ 967 |  | $ 782
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  | 6.70% |  |
Temporary Equity, Net Income |  |  |  | $ 9 | $ 8 |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  |  |  | 69 | 17 |
Eletropaulo [Domain] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  |  | 152 |  | 0
Colon [Domain] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Other Charges |  |  |  | 30 | 106 |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests | [1] |  |  | 137 |  | 100
IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Other Charges |  |  | $ 24 |  |  |
Temporary Equity, Stock Issued During Period, Value, New Issues |  | $ 134 |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  |  | 618 |  | 618
IPL Subsidiary [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  |  | 60 |  | 60
Other Entity [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  |  | $ 0 |  | $ 4
IPALCO Enterprises, Inc. [Member] | Additional Paid-in Capital [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  |  |  |  | $ 84 |
IPALCO Enterprises, Inc. [Member] | Retained Earnings [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  |  | $ (84) |  |  |
[1] | (1) Characteristics of quotas are similar to common stock.

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