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Revenues (Tables)
12 Months Ended
Dec. 31, 2023
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenues
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202320222021202320222021202320222021
Electric Utility:
Retail - residential$1,220 $1,233 $1,115 $641 $673 $620 $579 $560 $495 
Retail - commercial820 821 763 519 536 508 301 285 255 
Retail - industrial968 965 893 501 538 505 467 427 388 
Wholesale213 233 187 62 64 57 151 169 130 
Bulk power and other124 169 123 38 48 62 86 121 61 
Total Electric Utility3,345 3,421 3,081 1,761 1,859 1,752 1,584 1,562 1,329 
Gas Utility:
Retail - residential316 371 257 176 202 146 140 169 111 
Retail - commercial163 197 139 86 101 79 77 96 60 
Retail - industrial16 20 17 11 14 12 5 
Transportation/other45 54 43 27 34 28 18 20 15 
Total Gas Utility540 642 456 300 351 265 240 291 191 
Other Utility:
Steam45 39 36 45 39 36  — — 
Other utility7 10 13 4 10 3 
Total Other Utility52 49 49 49 46 46 3 
Non-Utility and Other:
Travero and other90 93 83  — —  — — 
Total Non-Utility and Other90 93 83  — —  — — 
Total revenues$4,027 $4,205 $3,669 $2,110 $2,256 $2,063 $1,827 $1,856 $1,523 
IPL [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenues
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202320222021202320222021202320222021
Electric Utility:
Retail - residential$1,220 $1,233 $1,115 $641 $673 $620 $579 $560 $495 
Retail - commercial820 821 763 519 536 508 301 285 255 
Retail - industrial968 965 893 501 538 505 467 427 388 
Wholesale213 233 187 62 64 57 151 169 130 
Bulk power and other124 169 123 38 48 62 86 121 61 
Total Electric Utility3,345 3,421 3,081 1,761 1,859 1,752 1,584 1,562 1,329 
Gas Utility:
Retail - residential316 371 257 176 202 146 140 169 111 
Retail - commercial163 197 139 86 101 79 77 96 60 
Retail - industrial16 20 17 11 14 12 5 
Transportation/other45 54 43 27 34 28 18 20 15 
Total Gas Utility540 642 456 300 351 265 240 291 191 
Other Utility:
Steam45 39 36 45 39 36  — — 
Other utility7 10 13 4 10 3 
Total Other Utility52 49 49 49 46 46 3 
Non-Utility and Other:
Travero and other90 93 83  — —  — — 
Total Non-Utility and Other90 93 83  — —  — — 
Total revenues$4,027 $4,205 $3,669 $2,110 $2,256 $2,063 $1,827 $1,856 $1,523 
WPL [Member]  
Disaggregation of Revenue [Line Items]  
Disaggregation of Revenues
Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
Alliant EnergyIPLWPL
202320222021202320222021202320222021
Electric Utility:
Retail - residential$1,220 $1,233 $1,115 $641 $673 $620 $579 $560 $495 
Retail - commercial820 821 763 519 536 508 301 285 255 
Retail - industrial968 965 893 501 538 505 467 427 388 
Wholesale213 233 187 62 64 57 151 169 130 
Bulk power and other124 169 123 38 48 62 86 121 61 
Total Electric Utility3,345 3,421 3,081 1,761 1,859 1,752 1,584 1,562 1,329 
Gas Utility:
Retail - residential316 371 257 176 202 146 140 169 111 
Retail - commercial163 197 139 86 101 79 77 96 60 
Retail - industrial16 20 17 11 14 12 5 
Transportation/other45 54 43 27 34 28 18 20 15 
Total Gas Utility540 642 456 300 351 265 240 291 191 
Other Utility:
Steam45 39 36 45 39 36  — — 
Other utility7 10 13 4 10 3 
Total Other Utility52 49 49 49 46 46 3 
Non-Utility and Other:
Travero and other90 93 83  — —  — — 
Total Non-Utility and Other90 93 83  — —  — — 
Total revenues$4,027 $4,205 $3,669 $2,110 $2,256 $2,063 $1,827 $1,856 $1,523