Income Taxes (Schedule Of Effective Income Tax Rates) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Effective Tax Rate [Line Items]
Overall income tax rate	2.00%	6.00%	1.00%	4.00%
IPL [Member]
Effective Tax Rate [Line Items]
Overall income tax rate	(22.00%)	(12.00%)	(20.00%)	(14.00%)
WPL [Member]
Effective Tax Rate [Line Items]
Overall income tax rate	16.00%	15.00%	15.00%	17.00%