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Commitments And Contingencies (Tables)
 12 Months Ended
Dec. 31, 2022
Long-term Purchase Commitment [Line Items]  
Other Purchase Commitments At December 31, 2022, the related minimum future commitments were as follows (in millions):
Alliant Energy20232024202520262027ThereafterTotal
Natural gas$558$297$199$136$85$209$1,484
Coal89642233—181
Other (a)721299224128
$719$373$230$148$90$233$1,793
IPL20232024202520262027ThereafterTotal
Natural gas$319$167$85$48$36$39$694
Coal45262033—97
Other (a)2822222258
$392$195$107$53$41$61$849
WPL20232024202520262027ThereafterTotal
Natural gas$239$130$114$88$49$170$790
Coal44382———84
Other (a)28111——31
$311$169$117$89$49$170$905

(a)Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2022.
Schedule of Environmental Liabilities At December 31, 2022, 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). At December 31, 2022, such amounts for WPL were not material.
Alliant EnergyIPL
Range of estimated future costs$9 -$25$6 -$19
Current and non-current environmental liabilities$11$8
IPL [Member]  
Long-term Purchase Commitment [Line Items]  
Other Purchase Commitments At December 31, 2022, the related minimum future commitments were as follows (in millions):
Alliant Energy20232024202520262027ThereafterTotal
Natural gas$558$297$199$136$85$209$1,484
Coal89642233—181
Other (a)721299224128
$719$373$230$148$90$233$1,793
IPL20232024202520262027ThereafterTotal
Natural gas$319$167$85$48$36$39$694
Coal45262033—97
Other (a)2822222258
$392$195$107$53$41$61$849
WPL20232024202520262027ThereafterTotal
Natural gas$239$130$114$88$49$170$790
Coal44382———84
Other (a)28111——31
$311$169$117$89$49$170$905

(a)Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2022.
Schedule of Environmental Liabilities At December 31, 2022, 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). At December 31, 2022, such amounts for WPL were not material.
Alliant EnergyIPL
Range of estimated future costs$9 -$25$6 -$19
Current and non-current environmental liabilities$11$8
WPL [Member]  
Long-term Purchase Commitment [Line Items]  
Other Purchase Commitments At December 31, 2022, the related minimum future commitments were as follows (in millions):
Alliant Energy20232024202520262027ThereafterTotal
Natural gas$558$297$199$136$85$209$1,484
Coal89642233—181
Other (a)721299224128
$719$373$230$148$90$233$1,793
IPL20232024202520262027ThereafterTotal
Natural gas$319$167$85$48$36$39$694
Coal45262033—97
Other (a)2822222258
$392$195$107$53$41$61$849
WPL20232024202520262027ThereafterTotal
Natural gas$239$130$114$88$49$170$790
Coal44382———84
Other (a)28111——31
$311$169$117$89$49$170$905

(a)Includes individual commitments incurred during the normal course of business that exceeded $1 million at December 31, 2022.