Consolidated Statements of Common Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	IPL [Member]	WPL [Member]	Common Stock [Member]	Common Stock [Member] IPL [Member]	Common Stock [Member] WPL [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] IPL [Member]	Additional Paid-in Capital [Member] WPL [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member] IPL [Member]	Retained Earnings [Member] WPL [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Shares in Deferred Compensation Trust [Member]	Cumulative Preferred Stock [Member]	Cumulative Preferred Stock [Member] IPL [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] WPL [Member]
Increase (Decrease) in Shareowners' Equity [Roll Forward]
Retained earnings		$ (9)										$ (9)
Beginning balance at Dec. 31, 2019					$ 2	$ 33	$ 66	$ 2,446	$ 2,348	$ 1,434	$ 2,766		$ 891	$ 864	$ 1	$ (10)	$ 200	$ 200	$ 0	$ 0
Beginning balance at Dec. 31, 2019	$ 5,405		$ 3,472	$ 2,364
Increase (Decrease) in Shareowners' Equity [Roll Forward]
Net income attributable to common shareowners	614		324								614		324
Net income	624		334	249										249
Common stock dividends	(377)		(236)	(160)							(377)		(236)	(160)
Equity forward settlements and Shareowner Direct Plan issuances	247							247
Capital contributions from parent			404	25					404	25
Equity-based compensation plans and other	10							11								(1)
Contributions from noncontrolling interest	0			0
Distributions to noncontrolling interest	0			0
Payments to redeem cumulative preferred stock of IPL	0		0
Other comprehensive income (loss), net of tax	(2)														(2)
Ending balance at Dec. 31, 2020					2	33	66	2,704	2,752	1,459	2,994		979	953	(1)	(11)	200	200	0	0
Ending balance at Dec. 31, 2020	5,888		3,964	2,478
Increase (Decrease) in Shareowners' Equity [Roll Forward]
Retained earnings		$ (9)
Net income attributable to common shareowners	659		350								659		350
Net income	674		365	268										268
Common stock dividends	(403)		(400)	(168)							(403)		(400)	(168)
Equity forward settlements and Shareowner Direct Plan issuances	28				1			27
Capital contributions from parent			50	245					50	245
Equity-based compensation plans and other	17		5					18	5							(1)
Contributions from noncontrolling interest	0			0
Distributions to noncontrolling interest	0			0
Payments to redeem cumulative preferred stock of IPL	(200)		(200)														(200)	(200)
Other comprehensive income (loss), net of tax	1														1
Ending balance at Dec. 31, 2021	5,990		3,769	2,823	3	33	66	2,749	2,807	1,704	3,250		929	1,053	0	(12)	0	0	0	0
Ending balance at Dec. 31, 2021	5,990		3,769	2,823
Increase (Decrease) in Shareowners' Equity [Roll Forward]
Retained earnings	3,250		929	1,053
Net income attributable to common shareowners	686		360								686		360
Net income	686		360	315										315
Common stock dividends	(428)		(321)	(176)							(428)		(321)	(176)
Equity forward settlements and Shareowner Direct Plan issuances	25							25
Capital contributions from parent			0	530						530
Equity-based compensation plans and other	3			(1)				3		(1)	1					(1)
Contributions from noncontrolling interest	29			29															29	29
Distributions to noncontrolling interest	(29)			(29)															(29)	(29)
Payments to redeem cumulative preferred stock of IPL	0		0
Ending balance at Dec. 31, 2022	6,276		3,808	3,491	$ 3	$ 33	$ 66	$ 2,777	$ 2,807	$ 2,233	$ 3,509		$ 968	$ 1,192	$ 0	$ (13)	$ 0	$ 0	$ 0	$ 0
Ending balance at Dec. 31, 2022	6,276		3,808	3,491
Increase (Decrease) in Shareowners' Equity [Roll Forward]
Retained earnings	$ 3,509		$ 968	$ 1,192