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Revenues
 6 Months Ended
Jun. 30, 2023
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 30202320222023202220232022
Electric Utility:
Retail - residential$284$289$151$158$133$131
Retail - commercial2011961291277269
Retail - industrial245244130136115108
Wholesale495414163538
Bulk power and other2029751324
Total Electric Utility799812431442368370
Gas Utility:
Retail - residential425124281823
Retail - commercial222712141013
Retail - industrial332211
Transportation/other10136845
Total Gas Utility779444523342
Other Utility:
Steam11111111——
Other utility221111
Total Other Utility1313121211
Non-Utility and Other:
Travero and other2324————
Total Non-Utility and Other2324————
Total revenues$912$943$487$506$402$413
Alliant EnergyIPLWPL
Six Months Ended June 30202320222023202220232022
Electric Utility:
Retail - residential$569$581$294$308$275$273
Retail - commercial385386241246144140
Retail - industrial460453236246224207
Wholesale9510126316970
Bulk power and other586522123653
Total Electric Utility1,5671,586819843748743
Gas Utility:
Retail - residential2102101171139397
Retail - commercial11010956545455
Retail - industrial9116734
Transportation/other2426151799
Total Gas Utility353356194191159165
Other Utility:
Steam22202220——
Other utility332211
Total Other Utility2523242211
Non-Utility and Other:
Travero and other4547————
Total Non-Utility and Other4547————
Total revenues$1,990$2,012$1,037$1,056$908$909
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 30202320222023202220232022
Electric Utility:
Retail - residential$284$289$151$158$133$131
Retail - commercial2011961291277269
Retail - industrial245244130136115108
Wholesale495414163538
Bulk power and other2029751324
Total Electric Utility799812431442368370
Gas Utility:
Retail - residential425124281823
Retail - commercial222712141013
Retail - industrial332211
Transportation/other10136845
Total Gas Utility779444523342
Other Utility:
Steam11111111——
Other utility221111
Total Other Utility1313121211
Non-Utility and Other:
Travero and other2324————
Total Non-Utility and Other2324————
Total revenues$912$943$487$506$402$413
Alliant EnergyIPLWPL
Six Months Ended June 30202320222023202220232022
Electric Utility:
Retail - residential$569$581$294$308$275$273
Retail - commercial385386241246144140
Retail - industrial460453236246224207
Wholesale9510126316970
Bulk power and other586522123653
Total Electric Utility1,5671,586819843748743
Gas Utility:
Retail - residential2102101171139397
Retail - commercial11010956545455
Retail - industrial9116734
Transportation/other2426151799
Total Gas Utility353356194191159165
Other Utility:
Steam22202220——
Other utility332211
Total Other Utility2523242211
Non-Utility and Other:
Travero and other4547————
Total Non-Utility and Other4547————
Total revenues$1,990$2,012$1,037$1,056$908$909
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 30202320222023202220232022
Electric Utility:
Retail - residential$284$289$151$158$133$131
Retail - commercial2011961291277269
Retail - industrial245244130136115108
Wholesale495414163538
Bulk power and other2029751324
Total Electric Utility799812431442368370
Gas Utility:
Retail - residential425124281823
Retail - commercial222712141013
Retail - industrial332211
Transportation/other10136845
Total Gas Utility779444523342
Other Utility:
Steam11111111——
Other utility221111
Total Other Utility1313121211
Non-Utility and Other:
Travero and other2324————
Total Non-Utility and Other2324————
Total revenues$912$943$487$506$402$413
Alliant EnergyIPLWPL
Six Months Ended June 30202320222023202220232022
Electric Utility:
Retail - residential$569$581$294$308$275$273
Retail - commercial385386241246144140
Retail - industrial460453236246224207
Wholesale9510126316970
Bulk power and other586522123653
Total Electric Utility1,5671,586819843748743
Gas Utility:
Retail - residential2102101171139397
Retail - commercial11010956545455
Retail - industrial9116734
Transportation/other2426151799
Total Gas Utility353356194191159165
Other Utility:
Steam22202220——
Other utility332211
Total Other Utility2523242211
Non-Utility and Other:
Travero and other4547————
Total Non-Utility and Other4547————
Total revenues$1,990$2,012$1,037$1,056$908$909