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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2022
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 September 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $376 |  | $348 |  | $222 |  | $207 |  | $154 |  | $141
Retail - commercial | 243 |  | 232 |  | 165 |  | 160 |  | 78 |  | 72
Retail - industrial | 289 |  | 265 |  | 172 |  | 158 |  | 117 |  | 107
Wholesale | 68 |  | 55 |  | 19 |  | 18 |  | 49 |  | 37
Bulk power and other | 63 |  | 39 |  | 18 |  | 12 |  | 45 |  | 27
Total Electric Utility | 1,039 |  | 939 |  | 596 |  | 555 |  | 443 |  | 384
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 28 |  | 24 |  | 14 |  | 14 |  | 14 |  | 10
Retail - commercial | 18 |  | 13 |  | 8 |  | 8 |  | 10 |  | 5
Retail - industrial | 4 |  | 3 |  | 3 |  | 3 |  | 1 |  | —
Transportation/other | 12 |  | 10 |  | 8 |  | 6 |  | 4 |  | 4
Total Gas Utility | 62 |  | 50 |  | 33 |  | 31 |  | 29 |  | 19
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 9 |  | 9 |  | 9 |  | — |  | —
Other utility | 2 |  | 4 |  | 2 |  | 4 |  | — |  | —
Total Other Utility | 11 |  | 13 |  | 11 |  | 13 |  | — |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 23 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 23 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,135 |  | $1,024 |  | $640 |  | $599 |  | $472 |  | $403
| Alliant Energy |  | IPL |  | WPL
Nine Months Ended September 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $956 |  | $868 |  | $529 |  | $488 |  | $427 |  | $380
Retail - commercial | 628 |  | 579 |  | 411 |  | 385 |  | 217 |  | 194
Retail - industrial | 743 |  | 677 |  | 418 |  | 386 |  | 325 |  | 291
Wholesale | 168 |  | 142 |  | 49 |  | 44 |  | 119 |  | 98
Bulk power and other | 129 |  | 91 |  | 31 |  | 40 |  | 98 |  | 51
Total Electric Utility | 2,624 |  | 2,357 |  | 1,438 |  | 1,343 |  | 1,186 |  | 1,014
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 237 |  | 162 |  | 127 |  | 90 |  | 110 |  | 72
Retail - commercial | 127 |  | 85 |  | 62 |  | 47 |  | 65 |  | 38
Retail - industrial | 15 |  | 11 |  | 10 |  | 8 |  | 5 |  | 3
Transportation/other | 39 |  | 31 |  | 25 |  | 20 |  | 14 |  | 11
Total Gas Utility | 418 |  | 289 |  | 224 |  | 165 |  | 194 |  | 124
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 29 |  | 27 |  | 29 |  | 27 |  | — |  | —
Other utility | 6 |  | 9 |  | 5 |  | 8 |  | 1 |  | 1
Total Other Utility | 35 |  | 36 |  | 34 |  | 35 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 70 |  | 60 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 70 |  | 60 |  | — |  | — |  | — |  | —
Total revenues | $3,147 |  | $2,742 |  | $1,696 |  | $1,543 |  | $1,381 |  | $1,139
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 September 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $376 |  | $348 |  | $222 |  | $207 |  | $154 |  | $141
Retail - commercial | 243 |  | 232 |  | 165 |  | 160 |  | 78 |  | 72
Retail - industrial | 289 |  | 265 |  | 172 |  | 158 |  | 117 |  | 107
Wholesale | 68 |  | 55 |  | 19 |  | 18 |  | 49 |  | 37
Bulk power and other | 63 |  | 39 |  | 18 |  | 12 |  | 45 |  | 27
Total Electric Utility | 1,039 |  | 939 |  | 596 |  | 555 |  | 443 |  | 384
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 28 |  | 24 |  | 14 |  | 14 |  | 14 |  | 10
Retail - commercial | 18 |  | 13 |  | 8 |  | 8 |  | 10 |  | 5
Retail - industrial | 4 |  | 3 |  | 3 |  | 3 |  | 1 |  | —
Transportation/other | 12 |  | 10 |  | 8 |  | 6 |  | 4 |  | 4
Total Gas Utility | 62 |  | 50 |  | 33 |  | 31 |  | 29 |  | 19
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 9 |  | 9 |  | 9 |  | — |  | —
Other utility | 2 |  | 4 |  | 2 |  | 4 |  | — |  | —
Total Other Utility | 11 |  | 13 |  | 11 |  | 13 |  | — |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 23 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 23 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,135 |  | $1,024 |  | $640 |  | $599 |  | $472 |  | $403
| Alliant Energy |  | IPL |  | WPL
Nine Months Ended September 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $956 |  | $868 |  | $529 |  | $488 |  | $427 |  | $380
Retail - commercial | 628 |  | 579 |  | 411 |  | 385 |  | 217 |  | 194
Retail - industrial | 743 |  | 677 |  | 418 |  | 386 |  | 325 |  | 291
Wholesale | 168 |  | 142 |  | 49 |  | 44 |  | 119 |  | 98
Bulk power and other | 129 |  | 91 |  | 31 |  | 40 |  | 98 |  | 51
Total Electric Utility | 2,624 |  | 2,357 |  | 1,438 |  | 1,343 |  | 1,186 |  | 1,014
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 237 |  | 162 |  | 127 |  | 90 |  | 110 |  | 72
Retail - commercial | 127 |  | 85 |  | 62 |  | 47 |  | 65 |  | 38
Retail - industrial | 15 |  | 11 |  | 10 |  | 8 |  | 5 |  | 3
Transportation/other | 39 |  | 31 |  | 25 |  | 20 |  | 14 |  | 11
Total Gas Utility | 418 |  | 289 |  | 224 |  | 165 |  | 194 |  | 124
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 29 |  | 27 |  | 29 |  | 27 |  | — |  | —
Other utility | 6 |  | 9 |  | 5 |  | 8 |  | 1 |  | 1
Total Other Utility | 35 |  | 36 |  | 34 |  | 35 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 70 |  | 60 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 70 |  | 60 |  | — |  | — |  | — |  | —
Total revenues | $3,147 |  | $2,742 |  | $1,696 |  | $1,543 |  | $1,381 |  | $1,139
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 September 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $376 |  | $348 |  | $222 |  | $207 |  | $154 |  | $141
Retail - commercial | 243 |  | 232 |  | 165 |  | 160 |  | 78 |  | 72
Retail - industrial | 289 |  | 265 |  | 172 |  | 158 |  | 117 |  | 107
Wholesale | 68 |  | 55 |  | 19 |  | 18 |  | 49 |  | 37
Bulk power and other | 63 |  | 39 |  | 18 |  | 12 |  | 45 |  | 27
Total Electric Utility | 1,039 |  | 939 |  | 596 |  | 555 |  | 443 |  | 384
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 28 |  | 24 |  | 14 |  | 14 |  | 14 |  | 10
Retail - commercial | 18 |  | 13 |  | 8 |  | 8 |  | 10 |  | 5
Retail - industrial | 4 |  | 3 |  | 3 |  | 3 |  | 1 |  | —
Transportation/other | 12 |  | 10 |  | 8 |  | 6 |  | 4 |  | 4
Total Gas Utility | 62 |  | 50 |  | 33 |  | 31 |  | 29 |  | 19
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 9 |  | 9 |  | 9 |  | — |  | —
Other utility | 2 |  | 4 |  | 2 |  | 4 |  | — |  | —
Total Other Utility | 11 |  | 13 |  | 11 |  | 13 |  | — |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 23 |  | 22 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 23 |  | 22 |  | — |  | — |  | — |  | —
Total revenues | $1,135 |  | $1,024 |  | $640 |  | $599 |  | $472 |  | $403
| Alliant Energy |  | IPL |  | WPL
Nine Months Ended September 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $956 |  | $868 |  | $529 |  | $488 |  | $427 |  | $380
Retail - commercial | 628 |  | 579 |  | 411 |  | 385 |  | 217 |  | 194
Retail - industrial | 743 |  | 677 |  | 418 |  | 386 |  | 325 |  | 291
Wholesale | 168 |  | 142 |  | 49 |  | 44 |  | 119 |  | 98
Bulk power and other | 129 |  | 91 |  | 31 |  | 40 |  | 98 |  | 51
Total Electric Utility | 2,624 |  | 2,357 |  | 1,438 |  | 1,343 |  | 1,186 |  | 1,014
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 237 |  | 162 |  | 127 |  | 90 |  | 110 |  | 72
Retail - commercial | 127 |  | 85 |  | 62 |  | 47 |  | 65 |  | 38
Retail - industrial | 15 |  | 11 |  | 10 |  | 8 |  | 5 |  | 3
Transportation/other | 39 |  | 31 |  | 25 |  | 20 |  | 14 |  | 11
Total Gas Utility | 418 |  | 289 |  | 224 |  | 165 |  | 194 |  | 124
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 29 |  | 27 |  | 29 |  | 27 |  | — |  | —
Other utility | 6 |  | 9 |  | 5 |  | 8 |  | 1 |  | 1
Total Other Utility | 35 |  | 36 |  | 34 |  | 35 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 70 |  | 60 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 70 |  | 60 |  | — |  | — |  | — |  | —
Total revenues | $3,147 |  | $2,742 |  | $1,696 |  | $1,543 |  | $1,381 |  | $1,139

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