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Revenues (Tables)
12 Months Ended
Dec. 31, 2022
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
202220212020202220212020202220212020
Electric Utility:
Retail - residential$1,233 $1,115 $1,093 $673 $620 $602 $560 $495 $491 
Retail - commercial821 763 718 536 508 474 285 255 244 
Retail - industrial965 893 841 538 505 488 427 388 353 
Wholesale233 187 168 64 57 57 169 130 111 
Bulk power and other169 123 100 48 62 74 121 61 26 
Total Electric Utility3,421 3,081 2,920 1,859 1,752 1,695 1,562 1,329 1,225 
Gas Utility:
Retail - residential371 257 214 202 146 116 169 111 98 
Retail - commercial197 139 107 101 79 59 96 60 48 
Retail - industrial20 17 12 14 12 6 
Transportation/other54 43 40 34 28 25 20 15 15 
Total Gas Utility642 456 373 351 265 208 291 191 165 
Other Utility:
Steam39 36 36 39 36 36  — — 
Other utility10 13 13 7 10 3 
Total Other Utility49 49 49 46 46 44 3 
Non-Utility and Other:
Travero and other93 83 74  — —  — — 
Total Non-Utility and Other93 83 74  — —  — — 
Total revenues$4,205 $3,669 $3,416 $2,256 $2,063 $1,947 $1,856 $1,523 $1,395 
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
202220212020202220212020202220212020
Electric Utility:
Retail - residential$1,233 $1,115 $1,093 $673 $620 $602 $560 $495 $491 
Retail - commercial821 763 718 536 508 474 285 255 244 
Retail - industrial965 893 841 538 505 488 427 388 353 
Wholesale233 187 168 64 57 57 169 130 111 
Bulk power and other169 123 100 48 62 74 121 61 26 
Total Electric Utility3,421 3,081 2,920 1,859 1,752 1,695 1,562 1,329 1,225 
Gas Utility:
Retail - residential371 257 214 202 146 116 169 111 98 
Retail - commercial197 139 107 101 79 59 96 60 48 
Retail - industrial20 17 12 14 12 6 
Transportation/other54 43 40 34 28 25 20 15 15 
Total Gas Utility642 456 373 351 265 208 291 191 165 
Other Utility:
Steam39 36 36 39 36 36  — — 
Other utility10 13 13 7 10 3 
Total Other Utility49 49 49 46 46 44 3 
Non-Utility and Other:
Travero and other93 83 74  — —  — — 
Total Non-Utility and Other93 83 74  — —  — — 
Total revenues$4,205 $3,669 $3,416 $2,256 $2,063 $1,947 $1,856 $1,523 $1,395 
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
202220212020202220212020202220212020
Electric Utility:
Retail - residential$1,233 $1,115 $1,093 $673 $620 $602 $560 $495 $491 
Retail - commercial821 763 718 536 508 474 285 255 244 
Retail - industrial965 893 841 538 505 488 427 388 353 
Wholesale233 187 168 64 57 57 169 130 111 
Bulk power and other169 123 100 48 62 74 121 61 26 
Total Electric Utility3,421 3,081 2,920 1,859 1,752 1,695 1,562 1,329 1,225 
Gas Utility:
Retail - residential371 257 214 202 146 116 169 111 98 
Retail - commercial197 139 107 101 79 59 96 60 48 
Retail - industrial20 17 12 14 12 6 
Transportation/other54 43 40 34 28 25 20 15 15 
Total Gas Utility642 456 373 351 265 208 291 191 165 
Other Utility:
Steam39 36 36 39 36 36  — — 
Other utility10 13 13 7 10 3 
Total Other Utility49 49 49 46 46 44 3 
Non-Utility and Other:
Travero and other93 83 74  — —  — — 
Total Non-Utility and Other93 83 74  — —  — — 
Total revenues$4,205 $3,669 $3,416 $2,256 $2,063 $1,947 $1,856 $1,523 $1,395