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Equity Equity Transactions with Noncontrolling Interests (Details) $ / shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2014 USD ($) | Sep. 30, 2014 USD ($) $ / shares | Sep. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Apr. 01, 2015 USD ($) | Mar. 15, 2015 USD ($) MW | Dec. 15, 2014 | Jun. 25, 2014 USD ($)
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Future Noncontrolling Interest, Ownership by noncontrolling owner once transaction is complete |  |  | 30.00% |  |  |  | 30.00% |  |  |  |  |
Business Combination, Separately Recognized Transactions, Additional Disclosures, Issuance Costs Not Expensed |  |  | $ 82,000,000 |  |  |  | $ 82,000,000 |  |  |  |  |
Sale of Stock, Consideration Received Per Transaction |  |  | 461,000,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Stock in Subsidiary |  |  | $ 0 |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  |  |  |  |  |  | $ (83,000,000) | $ 130,000,000 |  |  |  |
Dominican Republic [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds received from sale of businesses |  | $ 96,000,000 |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 8.00% |  |  |  | 8.00% |  | 8.00% |  |  |  |
Investment Options, Exercise Price | $ / shares |  | $ 24 |  |  |  |  |  |  |  |  |  |
Gain on Disposition of Stock in Subsidiary, Recorded to APIC |  |  |  |  | $ 29,000,000 |  |  |  |  |  |  |
Gain (Loss) on Disposition of Stock in Subsidiary |  |  |  |  | $ 0 |  |  |  |  |  |  |
IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds received from sale of businesses |  |  |  | $ 247,000,000 |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  | 100.00% |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 24.90% | 15.00% |  |  | 24.90% |  |  |  |  |
sales agreement, Buyer option to purchase ownership interest, exercised |  |  |  |  |  |  |  |  | $ 214,000,000 |  |  |
IPALCO Enterprises, Inc. [Member] | Acquire additional shares through 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale Agreement, Buyer Option To Purchase Ownership Interest, Sales Price |  |  | $ 135,000,000 | $ 349,000,000 |  |  |  |  |  |  |  |
Investment Options, acquisition percentage |  |  |  | 17.65% |  |  |  |  |  |  |  |
Masinloc Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds received from sale of businesses | $ 436,000,000 |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 51.00% |  |  |  |  |  |  |  |  |  |  |
Investment In Affiliate Ownership Percentage Sold |  |  |  |  |  |  |  |  |  |  |  | 45.00%
Divestiture of Business, Purchase Purchase Subject Adjustment |  |  |  |  |  |  |  |  |  |  |  | $ 453,000,000
Divestiture of Businesses, Portion Contingent Upon Achievement of Certain Restructuring Efficiencies | $ 23,000,000 |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Sale of Parent Equity Interest |  |  |  |  |  | $ 130,000,000 |  |  |  |  |  |
Masinloc Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal |  |  |  |  |  | $ 283,000,000 |  |  |  |  |  |
Jordan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group Not Discontinued Operation Ownership Interest Sold |  |  |  |  |  |  |  |  |  | 40.00% |  |
Disposal Group Not Discontinued Operation Generation Capacity | MW |  |  |  |  |  |  |  |  |  | 247 |  |
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |
Acquire addition shares through December 31, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment Options, acquisition percentage |  | 2.00% |  |  |  |  |  |  |  |  |  |
Acquire additional shares through December 31, 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment Options, acquisition percentage |  | 10.00% |  |  |  |  |  |  |  |  |  |
Acquire additional shares through 2016 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment Options, Exercise Price | $ / shares |  | $ 125 |  |  |  |  |  |  |  |  |  |
Additional Paid-in Capital [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Investments |  |  | 377,000,000 |  |  |  |  |  |  |  |  |
Retained Earnings [Member] | IPALCO Enterprises, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrealized Gain (Loss) on Investments |  |  | $ (377,000,000) |  |  |  |  |  |  |  |  |
Electricity Generating Public Company Limited [Member] | Masinloc Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 41.00% |  |  |  |  |  |  |  |  |  |  |
International Finance Corporation [Member] | Masinloc Subsidiary [Member] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 8.00% |  |  |  |  |  |  |  |  |  |  |

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