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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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