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Derivative Instruments (Notional Amounts Of Derivative Instruments) (Details) - Commodity [Member]
gal in Thousands, T in Thousands, MWh in Thousands, Dekatherms in Thousands
 12 Months Ended
Dec. 31, 2021
Dekatherms
MWh
T
gal
FTRs (MWhs) [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in MWhs) | MWh 9,135
FTRs (MWhs) [Member] | IPL [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in MWhs) | MWh 2,647
FTRs (MWhs) [Member] | WPL [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in MWhs) | MWh 6,488
Gas (Dths) [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Dths) | Dekatherms 191,670
Gas (Dths) [Member] | IPL [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Dths) | Dekatherms 100,560
Gas (Dths) [Member] | WPL [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Dths) | Dekatherms 91,110
Coal (Tons) [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Tons) | T 3,193
Coal (Tons) [Member] | IPL [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Tons) | T 1,270
Coal (Tons) [Member] | WPL [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Tons) | T 1,923
Diesel Fuel (gallons) [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Gallons) | gal 3,024
Diesel Fuel (gallons) [Member] | IPL [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Gallons) | gal 0
Diesel Fuel (gallons) [Member] | WPL [Member]  
Notional Amount of Derivatives [Line Items]  
Notional unit amount of derivatives (in Gallons) | gal 3,024