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Revenues (Tables)
 12 Months Ended
Dec. 31, 2024
Disaggregation of Revenue [Line Items]  
Disaggregation of 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
202420232022202420232022202420232022
Electric Utility:
Retail - residential$1,236 $1,220 $1,233 $640 $641 $673 $596 $579 $560 
Retail - commercial821 820 821 525 519 536 296 301 285 
Retail - industrial952 968 965 497 501 538 455 467 427 
Wholesale200 213 233 61 62 64 139 151 169 
Bulk power and other163 124 169 24 38 48 139 86 121 
Total Electric Utility3,372 3,345 3,421 1,747 1,761 1,859 1,625 1,584 1,562 
Gas Utility:
Retail - residential275 316 371 148 176 202 127 140 169 
Retail - commercial133 163 197 68 86 101 65 77 96 
Retail - industrial11 16 20 7 11 14 4 5 6 
Transportation/other46 45 54 27 27 34 19 18 20 
Total Gas Utility465 540 642 250 300 351 215 240 291 
Other Utility:
Steam40 45 39 40 45 39 — — — 
Other utility14 7 10 9 4 7 5 3 3 
Total Other Utility54 52 49 49 49 46 5 3 3 
Non-Utility and Other:
Travero and other90 90 93 — — — — — — 
Total Non-Utility and Other90 90 93 — — — — — — 
Total revenues$3,981 $4,027 $4,205 $2,046 $2,110 $2,256 $1,845 $1,827 $1,856 
IPL [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of 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
202420232022202420232022202420232022
Electric Utility:
Retail - residential$1,236 $1,220 $1,233 $640 $641 $673 $596 $579 $560 
Retail - commercial821 820 821 525 519 536 296 301 285 
Retail - industrial952 968 965 497 501 538 455 467 427 
Wholesale200 213 233 61 62 64 139 151 169 
Bulk power and other163 124 169 24 38 48 139 86 121 
Total Electric Utility3,372 3,345 3,421 1,747 1,761 1,859 1,625 1,584 1,562 
Gas Utility:
Retail - residential275 316 371 148 176 202 127 140 169 
Retail - commercial133 163 197 68 86 101 65 77 96 
Retail - industrial11 16 20 7 11 14 4 5 6 
Transportation/other46 45 54 27 27 34 19 18 20 
Total Gas Utility465 540 642 250 300 351 215 240 291 
Other Utility:
Steam40 45 39 40 45 39 — — — 
Other utility14 7 10 9 4 7 5 3 3 
Total Other Utility54 52 49 49 49 46 5 3 3 
Non-Utility and Other:
Travero and other90 90 93 — — — — — — 
Total Non-Utility and Other90 90 93 — — — — — — 
Total revenues$3,981 $4,027 $4,205 $2,046 $2,110 $2,256 $1,845 $1,827 $1,856 
WPL [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of 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
202420232022202420232022202420232022
Electric Utility:
Retail - residential$1,236 $1,220 $1,233 $640 $641 $673 $596 $579 $560 
Retail - commercial821 820 821 525 519 536 296 301 285 
Retail - industrial952 968 965 497 501 538 455 467 427 
Wholesale200 213 233 61 62 64 139 151 169 
Bulk power and other163 124 169 24 38 48 139 86 121 
Total Electric Utility3,372 3,345 3,421 1,747 1,761 1,859 1,625 1,584 1,562 
Gas Utility:
Retail - residential275 316 371 148 176 202 127 140 169 
Retail - commercial133 163 197 68 86 101 65 77 96 
Retail - industrial11 16 20 7 11 14 4 5 6 
Transportation/other46 45 54 27 27 34 19 18 20 
Total Gas Utility465 540 642 250 300 351 215 240 291 
Other Utility:
Steam40 45 39 40 45 39 — — — 
Other utility14 7 10 9 4 7 5 3 3 
Total Other Utility54 52 49 49 49 46 5 3 3 
Non-Utility and Other:
Travero and other90 90 93 — — — — — — 
Total Non-Utility and Other90 90 93 — — — — — — 
Total revenues$3,981 $4,027 $4,205 $2,046 $2,110 $2,256 $1,845 $1,827 $1,856