Segments Of Business (Schedule Of Segments Of Business) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenues	$ 1,031	$ 1,077
Operating income (loss)	222	222
Net income (loss) attributable to common shareowners	158	163
Net income	158	163
IPL [Member]
Segment Reporting Information [Line Items]
Revenues	513	549
Operating income (loss)	85	96
Net income	63	72
WPL [Member]
Segment Reporting Information [Line Items]
Revenues	496	506
Operating income (loss)	131	121
Net income	92	88
Electric [Member]
Segment Reporting Information [Line Items]
Revenues	791	768
Operating income (loss)	164	163
Electric [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	392	388
Operating income (loss)	57	66
Electric [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	399	380
Operating income (loss)	107	97
Gas [Member]
Segment Reporting Information [Line Items]
Revenues	205	276
Operating income (loss)	47	50
Gas [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	108	150
Operating income (loss)	22	27
Gas [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	97	126
Operating income (loss)	25	23
Other Utility [Member]
Segment Reporting Information [Line Items]
Revenues	13	11
Operating income (loss)	5	4
Other Utility [Member] | IPL [Member]
Segment Reporting Information [Line Items]
Revenues	13	11
Operating income (loss)	6	3
Other Utility [Member] | WPL [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Operating income (loss)	(1)	1
Non-utility and Other [Member]
Segment Reporting Information [Line Items]
Revenues	22	22
Operating income (loss)	6	5
Net income (loss) attributable to common shareowners	3	3
Utility Business [Member]
Segment Reporting Information [Line Items]
Revenues	1,009	1,055
Operating income (loss)	216	217
Net income (loss) attributable to common shareowners	$ 155	$ 160