Income Taxes (Schedule Of Effective Income Tax Rates) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Effective Tax Rate [Line Items]
Overall income tax rate	(9.00%)	(9.00%)	(13.00%)	(9.00%)
IPL [Member]
Effective Tax Rate [Line Items]
Overall income tax rate	(8.00%)	(14.00%)	(11.00%)	(14.00%)
WPL [Member]
Effective Tax Rate [Line Items]
Overall income tax rate	(19.00%)	(7.00%)	(24.00%)	(8.00%)