Segments Of Business (Schedule Of Segments Of Business) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 894	$ 912	$ 1,925	$ 1,990
Operating income (loss)	130	217	352	439
Net income (loss) attributable to common shareowners	87	160	245	323
Net income			245	323
IPL [Member]
Segment Reporting Information [Line Items]
Revenues	453	487	966	1,037
Operating income (loss)	16	110	101	206
Net income (loss) attributable to common shareowners	18	89	81	161
Net income	18	89	81	161
WPL [Member]
Segment Reporting Information [Line Items]
Revenues	415	402	911	908
Operating income (loss)	100	99	231	220
Net income (loss) attributable to common shareowners	64	72	156	160
Net income	64	72	156	160
Electric [Member]
Segment Reporting Information [Line Items]
Revenues	789	799	1,580	1,567
Operating income (loss)	131	200	295	363
Electric [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	404	431	795	819
Operating income (loss)	34	105	91	171
Electric [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	385	368	785	748
Operating income (loss)	97	95	204	192
Gas [Member]
Segment Reporting Information [Line Items]
Revenues	69	77	273	353
Operating income (loss)	1	2	48	52
Gas [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	40	44	148	194
Operating income (loss)	(1)	0	21	27
Gas [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	29	33	125	159
Operating income (loss)	2	2	27	25
Other Utility [Member]
Segment Reporting Information [Line Items]
Revenues	10	13	24	25
Operating income (loss)	(16)	7	(11)	11
Other Utility [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	9	12	23	24
Operating income (loss)	(17)	5	(11)	8
Other Utility [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	1	1	1	1
Operating income (loss)	1	2	0	3
Non-utility and Other [Member]
Segment Reporting Information [Line Items]
Revenues	26	23	48	45
Operating income (loss)	14	8	20	13
Net income (loss) attributable to common shareowners	5	(1)	8	2
Utility Business [Member]
Segment Reporting Information [Line Items]
Revenues	868	889	1,877	1,945
Operating income (loss)	116	209	332	426
Net income (loss) attributable to common shareowners	$ 82	$ 161	$ 237	$ 321