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v3.20.4

Redeemable Stock of Subsidiaries (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) quarter series $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Temporary Equity [Line Items] |  |  |  |
Temporary Equity, Accretion to Redemption Value |  | $ 4 | $ 6 |
Temporary equity carrying amount |  | 872 | 888 | $ 879
Temporary Equity, Other Changes |  | 0 | 10 |
Temporary Equity, Net Income |  | 8 | (7) |
Colon [Domain] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount | [1] | 194 | 210 |
Temporary Equity, Other Changes |  | 0 | 10 |
IPALCO Enterprises, Inc. [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount |  | 618 | 618 |
IPL Subsidiary |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount |  | 60 | 60 |
Temporary equity carrying amount |  | $ 60 | 60 |
Number of preferred stock series | series |  | 5 |  |
Temporary equity annual dividend requirement |  | $ 3 | 3 |
Number of consecutive quarters without paid dividends to invoke board of directors election rule | quarter |  | 4 |  |
IPL Subsidiary | Minimum |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Temporary equity, redemption price per share | $ / shares |  | $ 100 |  |
IPL Subsidiary | Maximum |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Temporary equity, redemption price per share | $ / shares |  | $ 118 |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Temporary Equity, Other Changes |  | $ (28) | $ 0 |
[1] | Characteristics of quotas are similar to common stock.

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