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Equity Equity Transactions with Noncontrolling Interests (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Feb. 18, 2016 | Mar. 31, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Capital Contributions From Noncontrolling Interests |  |  |  |  |  | $ 12,000,000 | $ 97,000,000
Business Combination, Separately Recognized Transactions, Additional Disclosures, Issuance Costs Not Expensed |  | $ 84,000,000 |  | $ 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 | (82,000,000)
Gain (loss) on disposal and sale of businesses |  |  | $ (17,000,000) |  | $ 0 | $ 30,000,000 | $ 0
IPP4 [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 36.00% |  |  | 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 disposal and sale of businesses | $ 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 |  |  | 82.00% |  |  | 82.00% |
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% |  |  | 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 |  |  | 18.00% |  |  | 18.00% |
AES US Holdings, LLC [Member] | AES US Investment, Inc. [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 85.00% |  |  | 85.00% |
Mitsui Ltd [Member] | IPP4 [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 40.00% |  |  | 40.00% |
Nebras Power Q.S.C [Member] | IPP4 [Member] |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 24.00% |  |  | 24.00% |

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