Segments Of Business (Schedule Of Segments Of Business) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 1,077	$ 1,135	$ 3,066	$ 3,147
Operating income (loss)	322	309	760	769
Net income (loss) attributable to common shareowners	259	227	582	579
Net income			582	579
IPL [Member]
Segment Reporting Information [Line Items]
Revenues	594	640	1,630	1,696
Operating income (loss)	173	171	379	389
Net income	170	154	331	327
WPL [Member]
Segment Reporting Information [Line Items]
Revenues	461	472	1,370	1,381
Operating income (loss)	142	131	363	357
Net income	107	91	267	247
Electric [Member]
Segment Reporting Information [Line Items]
Revenues	995	1,039	2,562	2,624
Operating income (loss)	319	304	682	680
Electric [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	551	596	1,370	1,438
Operating income (loss)	171	174	342	353
Electric [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	444	443	1,192	1,186
Operating income (loss)	148	130	340	327
Gas [Member]
Segment Reporting Information [Line Items]
Revenues	47	62	400	418
Operating income (loss)	(4)	(3)	48	62
Gas [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	31	33	224	224
Operating income (loss)	(2)	(3)	25	33
Gas [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	16	29	176	194
Operating income (loss)	(2)	0	23	29
Other Utility [Member]
Segment Reporting Information [Line Items]
Revenues	13	11	38	35
Operating income (loss)	0	1	12	4
Other Utility [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	12	11	36	34
Operating income (loss)	4	0	12	3
Other Utility [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	1	0	2	1
Operating income (loss)	(4)	1	0	1
Non-utility and Other [Member]
Segment Reporting Information [Line Items]
Revenues	22	23	66	70
Operating income (loss)	7	7	18	23
Net income (loss) attributable to common shareowners	(18)	(18)	(16)	5
Utility Business [Member]
Segment Reporting Information [Line Items]
Revenues	1,055	1,112	3,000	3,077
Operating income (loss)	315	302	742	746
Net income (loss) attributable to common shareowners	$ 277	$ 245	$ 598	$ 574