Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions		Total	Common Stock [Member]	Treasury Stock	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit)	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	IPALCO Enterprises, Inc. [Member] Retained Earnings (Accumulated Deficit)
Beginning Balance at Dec. 31, 2015			$ 8	$ (1,837)	$ 8,718	$ 143	$ (3,883)	$ 3,022
Beginning Balance (Shares) at Dec. 31, 2015			815.8	149.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		$ (777)	$ 0	$ 0	0	(1,130)	0	353
Total foreign currency translation adjustment, net of income tax		1,181	0	0	0	0	1,109	72
Total change in derivative fair value, net of income tax		42	0	0	0	0	30	12
Total pension adjustments, net of income tax		(187)	0	0	0	0	(12)	(175)
OTHER COMPREHENSIVE INCOME (LOSS)		1,036					1,127	(91)
Disposition of business interests (2)	[1]		0	0	0	0	0	(2)
Distributions to noncontrolling interests			0	0	(10)	0	0	(430)
Contributions from noncontrolling interests			0	0	0	0	0	60
Dividends declared on common stock			$ 0	$ 0	(226)	(71)	0	0
Purchase of treasury stock (shares)			0.0	8.7
Purchase of treasury stock			$ 0	$ (79)	0	0	0	0
Issuance and exercise of stock-based compensation benefit plans (Shares)			0.3	(0.8)
Issuance and exercise of stock-based compensation benefit plans, net of income tax			$ 0	$ 12	11	0	0	0
Sale of subsidiary shares to noncontrolling interests			0	0	84		0	17	$ (84)
Acquisition of subsidiary shares from noncontrolling interests			0	0	2	0	0	17
Fair value adjustment (1)	[2]		0	0	17	(4)	0	(17)
Ending Balance at Dec. 31, 2016			$ 8	$ (1,904)	8,592	(1,146)	(2,756)	2,906
Ending Balance (Shares) at Dec. 31, 2016			816.1	156.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Net Income			$ 0	$ 0	0	0	0	11
Net income (loss)		(777)	0	0	0	(1,161)	0	384
Total foreign currency translation adjustment, net of income tax		634	0	0	0	0	661	(27)
Total change in derivative fair value, net of income tax		38	0	0	0	0	23	15
Total pension adjustments, net of income tax		247	0	0	0	0	229	18
OTHER COMPREHENSIVE INCOME (LOSS)		919					913	6
Cumulative effect of a change in accounting principle (3)	[3]		0	0	0	31	0	0
Disposition of business interests (2)	[1]		0	0	0	0	0	(666)
Distributions to noncontrolling interests			0	0	0	0	0	(426)
Contributions from noncontrolling interests			0	0	0	0	0	11
Dividends declared on common stock			$ 0	$ 0	(324)	0	0	0
Issuance and exercise of stock-based compensation benefit plans (Shares)			0.2	(1.0)
Issuance and exercise of stock-based compensation benefit plans, net of income tax			$ 0	$ 12	5	0	0	0
Sale of subsidiary shares to noncontrolling interests			0	0	13		7	83	0
Acquisition of subsidiary shares from noncontrolling interests			0	0	(240)	0	(40)	(68)
Fair value adjustment (1)	[2]		0	0	(25)	0	0	0
Ending Balance at Dec. 31, 2017		4,845	$ 8	$ (1,892)	8,501	(2,276)	(1,876)	2,380
Ending Balance (Shares) at Dec. 31, 2017			816.3	155.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Net Income		(14)	$ 0	$ 0	0	0	0	14
Net income (loss)		1,565	0	0	0	1,203	0	360
Total foreign currency translation adjustment, net of income tax		(182)	0	0	0	0	(235)	53
Total change in derivative fair value, net of income tax		26	0	0	0	0	14	10
Total pension adjustments, net of income tax		5	0	0	0	0	7	(2)
OTHER COMPREHENSIVE INCOME (LOSS)		$ (151)					(214)	61
Disposition of business interests (2)	[1]		0	0	0	0	0	(250)
Distributions to noncontrolling interests			0	0	0	0	0	(343)
Contributions from noncontrolling interests			0	0	0	0	0	9
Dividends declared on common stock			$ 0	$ 0	(348)	0	0	0
Purchase of treasury stock (shares)		0.0
Issuance and exercise of stock-based compensation benefit plans (Shares)			0.9	(1.0)
Issuance and exercise of stock-based compensation benefit plans, net of income tax			$ 0	$ 14	8	0	0	0
Sale of subsidiary shares to noncontrolling interests			0	0	(3)		0	98	$ 0
Acquisition of subsidiary shares from noncontrolling interests					0
Fair value adjustment (1)	[2]		0	0	(4)	0	0	0
Ending Balance at Dec. 31, 2018		$ 5,604	$ 8	$ (1,878)	8,154	(1,005)	(2,071)	2,396
Ending Balance (Shares) at Dec. 31, 2018			817.2	154.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Temporary Equity, Net Income		$ 2
Cumulative Effect of New Accounting Principle in Period of Adoption	[3]		$ 0	$ 0	$ 0	$ 68	$ 19	$ 81

[1] See Note 23—Held-for-Sale and Dispositions for further information.

[2] Adjustment to the carrying amount of noncontrolling interest and redeemable stock of subsidiaries to fair value.

[3] See Note 1—General and Summary of Significant Accounting Policies for further information.