Consolidated Statements of Common Equity - USD ($) $ in Millions	Total	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] 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]
Beginning balance at Dec. 31, 2020				$ 2	$ 33	$ 66	$ 2,704	$ 2,752	$ 1,459	$ 2,994	$ 979	$ 953	$ (1)	$ (11)	$ 200	$ 200
Beginning balance at Dec. 31, 2020	$ 5,888	$ 3,964	$ 2,478
Increase (Decrease) in Shareowners' Equity [Roll Forward]
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)
At-the-market offering program, net 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)
Redemption of cumulative preferred stock of IPL	(200)	(200)													(200)	(200)
Other comprehensive income (loss), net of tax	1												1
Ending balance at Dec. 31, 2021				3	33	66	2,749	2,807	1,704	3,250	929	1,053	0	(12)	0	0
Ending balance at Dec. 31, 2021	5,990	3,769	2,823
Increase (Decrease) in Shareowners' Equity [Roll Forward]
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)
At-the-market offering program, net 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)
Redemption of 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
Ending balance at Dec. 31, 2022	6,276	3,808	3,491
Increase (Decrease) in Shareowners' Equity [Roll Forward]
Net income attributable to common shareowners	703	366								703	366
Net income	703	366	345									345
Common stock dividends	(456)	(280)	(184)							(456)	(280)	(184)
At-the-market offering program, net and Shareowner Direct Plan issuances	246						246
Capital contributions from parent		80	245					80	245
Equity-based compensation plans and other	7						7
Redemption of cumulative preferred stock of IPL	0	0
Other comprehensive income (loss), net of tax	1												1
Ending balance at Dec. 31, 2023	6,777	3,974	3,897	$ 3	$ 33	$ 66	$ 3,030	$ 2,887	$ 2,478	$ 3,756	$ 1,054	$ 1,353	$ 1	$ (13)	$ 0	$ 0
Ending balance at Dec. 31, 2023	$ 6,777	$ 3,974	$ 3,897