Amount of capital contributions from a noncontrolling interest.

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Percentage of equity interest in business disposed.

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For transactions that are recognized separately from the acquisition of assets and assumptions of liabilities in the business combination, such as related to pre-existing relationships with the acquiree, this element represents the disclosure of the amount of any issuance related costs which have not been expensed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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No definition available.

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Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-Section S99
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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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No definition available.

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

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Amount of increase in noncontrolling interest from sale of a portion of the parent's controlling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of consideration received by subsidiary or equity investee in exchange for shares of stock issued or sold. Includes amount of cash received, fair value of noncash assets received, and fair value of liabilities assumed by the investor.

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No definition available.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($)		3 Months Ended
	Feb. 18, 2016	Mar. 31, 2016	Mar. 31, 2015
Noncontrolling Interest [Line Items]
Capital Contributions From Noncontrolling Interests		$ 28,000,000	$ 67,000,000
Business Combination, Separately Recognized Transactions, Additional Disclosures, Issuance Costs Not Expensed		84,000,000
Sale of Stock, Consideration Received Per Transaction		594,000,000
Gain (Loss) on Disposition of Stock in Subsidiary		0
Noncontrolling Interest, Increase from Sale of Parent Equity Interest		17,000,000	(81,000,000)
Gain (Loss) on Disposition of Business		$ 47,000,000	$ 1,000,000
IPP4 [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		36.00%
IPALCO Enterprises, Inc. [Member]
Noncontrolling Interest [Line Items]
Capital Contributions From Noncontrolling Interests		$ 134,000,000
Jordan [Member]
Noncontrolling Interest [Line Items]
Disposal Group Not Discontinued Operation Ownership Interest Sold	40.00%
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds	$ 21,000,000
Gain (Loss) on Disposition of Business	$ 4,000,000
Additional Paid-in Capital [Member] \| IPALCO Enterprises, Inc. [Member]
Noncontrolling Interest [Line Items]
Unrealized Gain (Loss) on Investments		463,000,000
Retained Earnings [Member] \| IPALCO Enterprises, Inc. [Member]
Noncontrolling Interest [Line Items]
Unrealized Gain (Loss) on Investments		$ (463,000,000)
AES US Investment, Inc. [Member] \| IPALCO Enterprises, Inc. [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		82.35%
La Caisse de depot et Placement du Quebec (CDPQ) [Member] \| AES US Investment, Inc. [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		15.00%
La Caisse de depot et Placement du Quebec (CDPQ) [Member] \| IPALCO Enterprises, Inc. [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		17.65%
AES US Holdings, LLC [Member] \| AES US Investment, Inc. [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		85.00%
Mitsui Ltd [Member] \| IPP4 [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		40.00%
Nebras Power Q.S.C [Member] \| IPP4 [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		24.00%