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Redeemable Stocks of Subsidiaries (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Other Charges |  |  | $ (1) | $ 0 |  |
Temporary Equity, Stock Issued During Period, Value, New Issues |  |  | 0 | 134 |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  | $ 672 | $ 774 | 672 | $ 782 | $ 538
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 6.70% |  |  |
Temporary Equity, Net Income |  |  | $ (3) | 0 |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  |  | 18 | 17 |  |
Redeemable Preferred Stock [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity Reclassification |  | 0 | (4) | $ 0 |  |
Colon [Domain] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests | [1] |  | 96 |  | 100 |
IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |
Temporary Equity, Stock Issued During Period, Value, New Issues |  | $ 134 |  |  |  |
Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests |  |  | 618 |  | 618 |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 30.00% |  | 30.00% |  |
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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