Condensed Consolidated Statements Of Common Shareholder's Deficit And Noncontrolling Interest (USD $) In Thousands, unless otherwise specified	Indianapolis Power And Light Company [Member] Common Stock [Member]	Indianapolis Power And Light Company [Member] Paid In Capital [Member]	Indianapolis Power And Light Company [Member] Accumulated Deficit/Retained Earnings [Member]	Indianapolis Power And Light Company [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Indianapolis Power And Light Company [Member]	Paid In Capital [Member]	Accumulated Deficit/Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Preferred Stock Of Subsidiary [Member]	Total
Beginning Balance at Dec. 31, 2009	$ 324,537	$ 11,610	$ 417,311		$ 753,458	$ 9,820	$ (18,878)		$ 59,784	$ (9,058)
Comprehensive Income attributable to common stock:
Net income applicable to common stock			116,575		116,575		76,734			76,734
Unrealized loss on available for sale investment				(197)	(197)			(197)		(197)
Cash dividends declared on common stock			(111,522)		(111,522)
Distributions to AES							(73,200)			(73,200)
Contributions from parent		969			969	991				991
Balance at Dec. 31, 2010	324,537	12,579	422,364	(197)	759,283	10,811	(15,344)	(197)	59,784	(4,730)
Comprehensive Income attributable to common stock:
Net income applicable to common stock			102,185		102,185		57,362			57,362
Gain on sale of available for sale investment (net of income tax expense of $134)				197	197			197		197
Cash dividends declared on common stock			(80,603)		(80,603)
Distributions to AES							(59,231)			(59,231)
Contributions from parent		535			535	556				556
Balance at Dec. 31, 2011	324,537	13,114	443,946		781,597	11,367	(17,213)		59,784	(5,846)
Comprehensive Income attributable to common stock:
Net income applicable to common stock			100,916		100,916		68,783			68,783
Cash dividends declared on common stock			(96,700)		(96,700)
Distributions to AES							(66,600)			(66,600)
Contributions from parent		422			422	444				444
Balance at Dec. 31, 2012	$ 324,537	$ 13,536	$ 448,162		$ 786,235	$ 11,811	$ (15,030)		$ 59,784	$ (3,219)