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Benefit Plans (Recognized Compensation Expense And Income Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Compensation expense $ 12 $ 13 $ 14
Income tax benefits 3 3 4
IPL [Member]      
Compensation expense 6 7 8
Income tax benefits 2 2 2
WPL [Member]      
Compensation expense 5 5 6
Income tax benefits $ 1 $ 1 $ 2