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Redeemable Stocks of Subsidiaries (Details) - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2021	Sep. 13, 2021	Dec. 31, 2020
Temporary Equity [Line Items]
Redeemable Noncontrolling Interest, Equity, Carrying Amount		$ 934		$ 872
Redeemable noncontrolling interest, percentage acquired by parent			49.90%
AIMco
Temporary Equity [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		25.00%
Colon [Domain]
Temporary Equity [Line Items]
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount	[1]	$ 0		194
IPALCO Enterprises, Inc. [Member]
Temporary Equity [Line Items]
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		618		618
IPL Subsidiary [Member]
Temporary Equity [Line Items]
Redeemable Noncontrolling Interest, Equity, Preferred, Carrying Amount		60		60
Clean Energy
Temporary Equity [Line Items]
Temporary Equity, Other Charges		81
Redeemable Noncontrolling Interest, Equity, Common, Carrying Amount		$ 256		$ 0
[1] Characteristics of quotas are similar to common stock.

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- Definition

Redeemable noncontrolling interest, percentage acquired by parent

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of common shares (regardless of class), limited partnership units (regardless of class), non-preferential membership interests, or any other form of common equity regardless of investee entity legal form.

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As of the reporting date, the carrying amount of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of increase (decrease) in temporary equity from changes classified as other.

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