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Revenues
 6 Months Ended
Jun. 30, 2024
Disaggregation of Revenue [Line Items]  
Revenues from Contracts with Customers REVENUES
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
Three Months Ended June 30202420232024202320242023
Electric Utility:
Retail - residential$291$284$151$151$140$133
Retail - commercial1912011181297372
Retail - industrial237245118130119115
Wholesale434913143035
Bulk power and other2720472313
Total Electric Utility789799404431385368
Gas Utility:
Retail - residential384222241618
Retail - commercial19221112810
Retail - industrial231211
Transportation/other10106644
Total Gas Utility697740442933
Other Utility:
Steam911911——
Other utility12—111
Total Other Utility101391211
Non-Utility and Other:
Travero and other2623————
Total Non-Utility and Other2623————
Total revenues$894$912$453$487$415$402
Alliant EnergyIPLWPL
Six Months Ended June 30202420232024202320242023
Electric Utility:
Retail - residential$588$569$301$294$287$275
Retail - commercial377385232241145144
Retail - industrial460460229236231224
Wholesale899526266369
Bulk power and other66587225936
Total Electric Utility1,5801,567795819785748
Gas Utility:
Retail - residential165210901177593
Retail - commercial8011041563954
Retail - industrial694623
Transportation/other2224131599
Total Gas Utility273353148194125159
Other Utility:
Steam20222022——
Other utility433211
Total Other Utility2425232411
Non-Utility and Other:
Travero and other4845————
Total Non-Utility and Other4845————
Total revenues$1,925$1,990$966$1,037$911$908
IPL [Member]  
Disaggregation of Revenue [Line Items]  
Revenues from Contracts with Customers REVENUES
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
Three Months Ended June 30202420232024202320242023
Electric Utility:
Retail - residential$291$284$151$151$140$133
Retail - commercial1912011181297372
Retail - industrial237245118130119115
Wholesale434913143035
Bulk power and other2720472313
Total Electric Utility789799404431385368
Gas Utility:
Retail - residential384222241618
Retail - commercial19221112810
Retail - industrial231211
Transportation/other10106644
Total Gas Utility697740442933
Other Utility:
Steam911911——
Other utility12—111
Total Other Utility101391211
Non-Utility and Other:
Travero and other2623————
Total Non-Utility and Other2623————
Total revenues$894$912$453$487$415$402
Alliant EnergyIPLWPL
Six Months Ended June 30202420232024202320242023
Electric Utility:
Retail - residential$588$569$301$294$287$275
Retail - commercial377385232241145144
Retail - industrial460460229236231224
Wholesale899526266369
Bulk power and other66587225936
Total Electric Utility1,5801,567795819785748
Gas Utility:
Retail - residential165210901177593
Retail - commercial8011041563954
Retail - industrial694623
Transportation/other2224131599
Total Gas Utility273353148194125159
Other Utility:
Steam20222022——
Other utility433211
Total Other Utility2425232411
Non-Utility and Other:
Travero and other4845————
Total Non-Utility and Other4845————
Total revenues$1,925$1,990$966$1,037$911$908
WPL [Member]  
Disaggregation of Revenue [Line Items]  
Revenues from Contracts with Customers REVENUES
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
Three Months Ended June 30202420232024202320242023
Electric Utility:
Retail - residential$291$284$151$151$140$133
Retail - commercial1912011181297372
Retail - industrial237245118130119115
Wholesale434913143035
Bulk power and other2720472313
Total Electric Utility789799404431385368
Gas Utility:
Retail - residential384222241618
Retail - commercial19221112810
Retail - industrial231211
Transportation/other10106644
Total Gas Utility697740442933
Other Utility:
Steam911911——
Other utility12—111
Total Other Utility101391211
Non-Utility and Other:
Travero and other2623————
Total Non-Utility and Other2623————
Total revenues$894$912$453$487$415$402
Alliant EnergyIPLWPL
Six Months Ended June 30202420232024202320242023
Electric Utility:
Retail - residential$588$569$301$294$287$275
Retail - commercial377385232241145144
Retail - industrial460460229236231224
Wholesale899526266369
Bulk power and other66587225936
Total Electric Utility1,5801,567795819785748
Gas Utility:
Retail - residential165210901177593
Retail - commercial8011041563954
Retail - industrial694623
Transportation/other2224131599
Total Gas Utility273353148194125159
Other Utility:
Steam20222022——
Other utility433211
Total Other Utility2425232411
Non-Utility and Other:
Travero and other4845————
Total Non-Utility and Other4845————
Total revenues$1,925$1,990$966$1,037$911$908