Benefit Plans (Recognized Compensation Expense And Income Tax Benefits) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Compensation expense	$ 4	$ 3	$ 10	$ 9
Income tax benefits	1	1	3	3
IPL [Member]
Compensation expense	2	2	5	5
Income tax benefits	1	0	1	1
WPL [Member]
Compensation expense	2	1	4	4
Income tax benefits	$ 0	$ 0	$ 1	$ 1