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Revenues
 3 Months Ended
Mar. 31, 2025
Disaggregation of Revenue [Line Items]  
Revenues from Contracts with Customers REVENUES
Disaggregation of revenues from contracts with customers is provided for each reportable segment (IPL and WPL), as well as by customer class within electric and gas sales, as follows (in millions):
Alliant EnergyIPLWPL
Three Months Ended March 31202520242025202420252024
Electric Utility:
Retail - residential$323$297$155$150$168$147
Retail - commercial2131861351147872
Retail - industrial237223119112118111
Wholesale484714133434
Bulk power and other3238732535
Total Electric Utility853791430392423399
Gas Utility:
Retail - residential14512673687258
Retail - commercial736132304131
Retail - industrial653332
Transportation/other161310766
Total Gas Utility24020511810812297
Other Utility:
Steam10121012——
Other utility31211—
Total Other Utility131312131—
Non-Utility and Other:
Travero and other2222————
Total Non-Utility and Other2222————
Total revenues$1,128$1,031$560$513$546$496
IPL [Member]  
Disaggregation of Revenue [Line Items]  
Revenues from Contracts with Customers REVENUES
Disaggregation of revenues from contracts with customers is provided for each reportable segment (IPL and WPL), as well as by customer class within electric and gas sales, as follows (in millions):
Alliant EnergyIPLWPL
Three Months Ended March 31202520242025202420252024
Electric Utility:
Retail - residential$323$297$155$150$168$147
Retail - commercial2131861351147872
Retail - industrial237223119112118111
Wholesale484714133434
Bulk power and other3238732535
Total Electric Utility853791430392423399
Gas Utility:
Retail - residential14512673687258
Retail - commercial736132304131
Retail - industrial653332
Transportation/other161310766
Total Gas Utility24020511810812297
Other Utility:
Steam10121012——
Other utility31211—
Total Other Utility131312131—
Non-Utility and Other:
Travero and other2222————
Total Non-Utility and Other2222————
Total revenues$1,128$1,031$560$513$546$496
WPL [Member]  
Disaggregation of Revenue [Line Items]  
Revenues from Contracts with Customers REVENUES
Disaggregation of revenues from contracts with customers is provided for each reportable segment (IPL and WPL), as well as by customer class within electric and gas sales, as follows (in millions):
Alliant EnergyIPLWPL
Three Months Ended March 31202520242025202420252024
Electric Utility:
Retail - residential$323$297$155$150$168$147
Retail - commercial2131861351147872
Retail - industrial237223119112118111
Wholesale484714133434
Bulk power and other3238732535
Total Electric Utility853791430392423399
Gas Utility:
Retail - residential14512673687258
Retail - commercial736132304131
Retail - industrial653332
Transportation/other161310766
Total Gas Utility24020511810812297
Other Utility:
Steam10121012——
Other utility31211—
Total Other Utility131312131—
Non-Utility and Other:
Travero and other2222————
Total Non-Utility and Other2222————
Total revenues$1,128$1,031$560$513$546$496