Benefit Plans (Recognized Compensation Expense And Income Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Compensation expense	$ 13	$ 14	$ 16
Income tax benefits	3	4	4
IPL [Member]
Compensation expense	7	8	9
Income tax benefits	2	2	2
WPL [Member]
Compensation expense	5	6	6
Income tax benefits	$ 1	$ 2	$ 2