Segments Of Business (Schedule Of Segments Of Business) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 1,081	$ 1,077	$ 3,005	$ 3,066
Operating income (loss)	313	322	665	760
Net income (loss) attributable to common shareowners	295	259	540	582
Net income			540	582
IPL [Member]
Segment Reporting Information [Line Items]
Revenues	561	594	1,527	1,630
Operating income (loss)	149	173	250	379
Net income (loss) attributable to common shareowners	190	170	272	331
Net income	190	170	272	331
WPL [Member]
Segment Reporting Information [Line Items]
Revenues	499	461	1,410	1,370
Operating income (loss)	156	142	387	363
Net income (loss) attributable to common shareowners	114	107	270	267
Net income	114	107	270	267
Electric [Member]
Segment Reporting Information [Line Items]
Revenues	999	995	2,579	2,562
Operating income (loss)	305	319	600	682
Electric [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	523	551	1,318	1,370
Operating income (loss)	148	171	239	342
Electric [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	476	444	1,261	1,192
Operating income (loss)	157	148	361	340
Gas [Member]
Segment Reporting Information [Line Items]
Revenues	49	47	322	400
Operating income (loss)	(4)	(4)	44	48
Gas [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	27	31	175	224
Operating income (loss)	(3)	(2)	18	25
Gas [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	22	16	147	176
Operating income (loss)	(1)	(2)	26	23
Other Utility [Member]
Segment Reporting Information [Line Items]
Revenues	12	13	36	38
Operating income (loss)	4	0	(7)	12
Other Utility [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	11	12	34	36
Operating income (loss)	4	4	(7)	12
Other Utility [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	1	1	2	2
Operating income (loss)	0	(4)	0	0
Non-utility and Other [Member]
Segment Reporting Information [Line Items]
Revenues	21	22	68	66
Operating income (loss)	8	7	28	18
Net income (loss) attributable to common shareowners	(9)	(18)	(2)	(16)
Utility Business [Member]
Segment Reporting Information [Line Items]
Revenues	1,060	1,055	2,937	3,000
Operating income (loss)	305	315	637	742
Net income (loss) attributable to common shareowners	$ 304	$ 277	$ 542	$ 598