Income Taxes (Schedule Of Effective Income Tax Rates) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Effective Tax Rate [Line Items]
Overall income tax rate	(13.00%)	(6.00%)	(16.00%)	(10.00%)
IPL [Member]
Effective Tax Rate [Line Items]
Overall income tax rate	(13.00%)	(7.00%)	(15.00%)	(14.00%)
WPL [Member]
Effective Tax Rate [Line Items]
Overall income tax rate	(23.00%)	(9.00%)	(27.00%)	(9.00%)