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Commitments And Contingencies (Tables)
 9 Months Ended
Sep. 30, 2023
Commitments and Contingencies [Line Items]  
Other Purchase Commitments At September 30, 2023, related minimum future commitments were as follows (in millions):
Alliant EnergyIPLWPL
Natural gas$962$436$526
Coal18810880
Other (a)1255225
$1,275$596$631

(a)Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2023.
MGP Site Estimated Future Costs And Recorded Liabilities At September 30, 2023, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, which are not discounted, were as follows (in millions):
Alliant EnergyIPLWPL
Range of estimated future costs$9 
-
$36$5 
-
$11$4 
-
$25
Current and non-current environmental liabilities$18$8$10
IPL [Member]  
Commitments and Contingencies [Line Items]  
Other Purchase Commitments At September 30, 2023, related minimum future commitments were as follows (in millions):
Alliant EnergyIPLWPL
Natural gas$962$436$526
Coal18810880
Other (a)1255225
$1,275$596$631

(a)Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2023.
MGP Site Estimated Future Costs And Recorded Liabilities At September 30, 2023, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, which are not discounted, were as follows (in millions):
Alliant EnergyIPLWPL
Range of estimated future costs$9 
-
$36$5 
-
$11$4 
-
$25
Current and non-current environmental liabilities$18$8$10
WPL [Member]  
Commitments and Contingencies [Line Items]  
Other Purchase Commitments At September 30, 2023, related minimum future commitments were as follows (in millions):
Alliant EnergyIPLWPL
Natural gas$962$436$526
Coal18810880
Other (a)1255225
$1,275$596$631

(a)Includes individual commitments incurred during the normal course of business that exceeded $1 million at September 30, 2023.
MGP Site Estimated Future Costs And Recorded Liabilities At September 30, 2023, estimated future costs expected to be incurred for the investigation, remediation and monitoring of the MGP sites, as well as environmental liabilities recorded on the balance sheets for these sites, which are not discounted, were as follows (in millions):
Alliant EnergyIPLWPL
Range of estimated future costs$9 
-
$36$5 
-
$11$4 
-
$25
Current and non-current environmental liabilities$18$8$10