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Revenues (Tables) | 3 Months Ended
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Mar. 31, 2024
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Three Months Ended March 31 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $297 |  | $285 |  | $150 |  | $143 |  | $147 |  | $142
Retail - commercial | 186 |  | 185 |  | 114 |  | 112 |  | 72 |  | 73
Retail - industrial | 223 |  | 216 |  | 112 |  | 107 |  | 111 |  | 109
Wholesale | 47 |  | 46 |  | 13 |  | 12 |  | 34 |  | 34
Bulk power and other | 38 |  | 36 |  | 3 |  | 14 |  | 35 |  | 22
Total Electric Utility | 791 |  | 768 |  | 392 |  | 388 |  | 399 |  | 380
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 126 |  | 167 |  | 68 |  | 93 |  | 58 |  | 74
Retail - commercial | 61 |  | 88 |  | 30 |  | 44 |  | 31 |  | 44
Retail - industrial | 5 |  | 7 |  | 3 |  | 4 |  | 2 |  | 3
Transportation/other | 13 |  | 14 |  | 7 |  | 9 |  | 6 |  | 5
Total Gas Utility | 205 |  | 276 |  | 108 |  | 150 |  | 97 |  | 126
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 12 |  | 10 |  | 12 |  | 10 |  | — |  | —
Other utility | 1 |  | 1 |  | 1 |  | 1 |  | — |  | —
Total Other Utility | 13 |  | 11 |  | 13 |  | 11 |  | — |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 22 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 22 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,031 |  | $1,077 |  | $513 |  | $549 |  | $496 |  | $506
IPL [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Three Months Ended March 31 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $297 |  | $285 |  | $150 |  | $143 |  | $147 |  | $142
Retail - commercial | 186 |  | 185 |  | 114 |  | 112 |  | 72 |  | 73
Retail - industrial | 223 |  | 216 |  | 112 |  | 107 |  | 111 |  | 109
Wholesale | 47 |  | 46 |  | 13 |  | 12 |  | 34 |  | 34
Bulk power and other | 38 |  | 36 |  | 3 |  | 14 |  | 35 |  | 22
Total Electric Utility | 791 |  | 768 |  | 392 |  | 388 |  | 399 |  | 380
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 126 |  | 167 |  | 68 |  | 93 |  | 58 |  | 74
Retail - commercial | 61 |  | 88 |  | 30 |  | 44 |  | 31 |  | 44
Retail - industrial | 5 |  | 7 |  | 3 |  | 4 |  | 2 |  | 3
Transportation/other | 13 |  | 14 |  | 7 |  | 9 |  | 6 |  | 5
Total Gas Utility | 205 |  | 276 |  | 108 |  | 150 |  | 97 |  | 126
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 12 |  | 10 |  | 12 |  | 10 |  | — |  | —
Other utility | 1 |  | 1 |  | 1 |  | 1 |  | — |  | —
Total Other Utility | 13 |  | 11 |  | 13 |  | 11 |  | — |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 22 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 22 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,031 |  | $1,077 |  | $513 |  | $549 |  | $496 |  | $506
WPL [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Disaggregation of revenues from contracts with customers, which correlates to revenues for each reportable segment, was as follows (in millions):
| Alliant Energy |  | IPL |  | WPL
Three Months Ended March 31 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $297 |  | $285 |  | $150 |  | $143 |  | $147 |  | $142
Retail - commercial | 186 |  | 185 |  | 114 |  | 112 |  | 72 |  | 73
Retail - industrial | 223 |  | 216 |  | 112 |  | 107 |  | 111 |  | 109
Wholesale | 47 |  | 46 |  | 13 |  | 12 |  | 34 |  | 34
Bulk power and other | 38 |  | 36 |  | 3 |  | 14 |  | 35 |  | 22
Total Electric Utility | 791 |  | 768 |  | 392 |  | 388 |  | 399 |  | 380
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 126 |  | 167 |  | 68 |  | 93 |  | 58 |  | 74
Retail - commercial | 61 |  | 88 |  | 30 |  | 44 |  | 31 |  | 44
Retail - industrial | 5 |  | 7 |  | 3 |  | 4 |  | 2 |  | 3
Transportation/other | 13 |  | 14 |  | 7 |  | 9 |  | 6 |  | 5
Total Gas Utility | 205 |  | 276 |  | 108 |  | 150 |  | 97 |  | 126
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 12 |  | 10 |  | 12 |  | 10 |  | — |  | —
Other utility | 1 |  | 1 |  | 1 |  | 1 |  | — |  | —
Total Other Utility | 13 |  | 11 |  | 13 |  | 11 |  | — |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 22 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 22 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,031 |  | $1,077 |  | $513 |  | $549 |  | $496 |  | $506

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