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Income Taxes (Schedule Of Components Of Income Tax) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current tax expense (benefit):      
Federal $ 1 $ 1 $ (7)
State 3 8 24
Deferred tax expense (benefit):      
Federal 9 22 70
State 15 8 42
Production tax credits (101) (95) (55)
Investment tax credits (1) (1) (1)
Income tax expense (benefit) (74) (57) 69
IPL's tax benefit riders [Member]      
Current tax expense (benefit):      
IPL's tax benefit riders 0 0 (4)
IPL [Member]      
Current tax expense (benefit):      
Federal (21) 6 (11)
State (1) (1) 24
Deferred tax expense (benefit):      
Federal 73 30 26
State 0 (2) 31
Production tax credits (87) (80) (42)
Investment tax credits 0 0 0
Income tax expense (benefit) (36) (47) 24
IPL [Member] | IPL's tax benefit riders [Member]      
Current tax expense (benefit):      
IPL's tax benefit riders 0 0 (4)
WPL [Member]      
Current tax expense (benefit):      
Federal 22 (11) 12
State 6 7 13
Deferred tax expense (benefit):      
Federal (75) (9) 31
State 11 10 6
Production tax credits (14) (15) (13)
Investment tax credits (1) (1) 0
Income tax expense (benefit) $ (51) $ (19) $ 49