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Revenues (Tables)
 9 Months Ended
Sep. 30, 2025
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue
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 September 30202520242025202420252024
Electric Utility:
Retail - residential$408$378$215$202$193$176
Retail - commercial2822391921539086
Retail - industrial306270167142139128
Wholesale515811194039
Bulk power and other77542375447
Total Electric Utility1,124999608523516476
Gas Utility:
Retail - residential242412131211
Retail - commercial13137766
Retail - industrial1111——
Transportation/other13117665
Total Gas Utility514927272422
Other Utility:
Steam9999——
Other utility3332—1
Total Other Utility12121211—1
Non-Utility and Other:
Travero and other2321————
Total Non-Utility and Other2321————
Total revenues$1,210$1,081$647$561$540$499
Alliant EnergyIPLWPL
Nine Months Ended September 30202520242025202420252024
Electric Utility:
Retail - residential$1,027$966$512$502$515$464
Retail - commercial705616462385243231
Retail - industrial782730403372379358
Wholesale1481473945109102
Bulk power and other1661203914127106
Total Electric Utility2,8282,5791,4551,3181,3731,261
Gas Utility:
Retail - residential21118910710310486
Retail - commercial1069249485744
Retail - industrial1086543
Transportation/other393323191614
Total Gas Utility366322185175181147
Other Utility:
Steam28292829——
Other utility978512
Total Other Utility3736363412
Non-Utility and Other:
Travero and other6768————
Total Non-Utility and Other6768————
Total revenues$3,298$3,005$1,676$1,527$1,555$1,410
IPL [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue
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 September 30202520242025202420252024
Electric Utility:
Retail - residential$408$378$215$202$193$176
Retail - commercial2822391921539086
Retail - industrial306270167142139128
Wholesale515811194039
Bulk power and other77542375447
Total Electric Utility1,124999608523516476
Gas Utility:
Retail - residential242412131211
Retail - commercial13137766
Retail - industrial1111——
Transportation/other13117665
Total Gas Utility514927272422
Other Utility:
Steam9999——
Other utility3332—1
Total Other Utility12121211—1
Non-Utility and Other:
Travero and other2321————
Total Non-Utility and Other2321————
Total revenues$1,210$1,081$647$561$540$499
Alliant EnergyIPLWPL
Nine Months Ended September 30202520242025202420252024
Electric Utility:
Retail - residential$1,027$966$512$502$515$464
Retail - commercial705616462385243231
Retail - industrial782730403372379358
Wholesale1481473945109102
Bulk power and other1661203914127106
Total Electric Utility2,8282,5791,4551,3181,3731,261
Gas Utility:
Retail - residential21118910710310486
Retail - commercial1069249485744
Retail - industrial1086543
Transportation/other393323191614
Total Gas Utility366322185175181147
Other Utility:
Steam28292829——
Other utility978512
Total Other Utility3736363412
Non-Utility and Other:
Travero and other6768————
Total Non-Utility and Other6768————
Total revenues$3,298$3,005$1,676$1,527$1,555$1,410
WPL [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenue
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 September 30202520242025202420252024
Electric Utility:
Retail - residential$408$378$215$202$193$176
Retail - commercial2822391921539086
Retail - industrial306270167142139128
Wholesale515811194039
Bulk power and other77542375447
Total Electric Utility1,124999608523516476
Gas Utility:
Retail - residential242412131211
Retail - commercial13137766
Retail - industrial1111——
Transportation/other13117665
Total Gas Utility514927272422
Other Utility:
Steam9999——
Other utility3332—1
Total Other Utility12121211—1
Non-Utility and Other:
Travero and other2321————
Total Non-Utility and Other2321————
Total revenues$1,210$1,081$647$561$540$499
Alliant EnergyIPLWPL
Nine Months Ended September 30202520242025202420252024
Electric Utility:
Retail - residential$1,027$966$512$502$515$464
Retail - commercial705616462385243231
Retail - industrial782730403372379358
Wholesale1481473945109102
Bulk power and other1661203914127106
Total Electric Utility2,8282,5791,4551,3181,3731,261
Gas Utility:
Retail - residential21118910710310486
Retail - commercial1069249485744
Retail - industrial1086543
Transportation/other393323191614
Total Gas Utility366322185175181147
Other Utility:
Steam28292829——
Other utility978512
Total Other Utility3736363412
Non-Utility and Other:
Travero and other6768————
Total Non-Utility and Other6768————
Total revenues$3,298$3,005$1,676$1,527$1,555$1,410