Benefit Plans (Recognized Compensation Expense And Income Tax Benefits) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Compensation expense	$ 3	$ 3	$ 6	$ 7
Income tax benefits	1	1	2	2
IPL [Member]
Compensation expense	2	1	3	4
Income tax benefits	0	0	1	1
WPL [Member]
Compensation expense	1	1	2	3
Income tax benefits	$ 0	$ 0	$ 1	$ 1