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Revenues (Tables) | 6 Months Ended
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Jun. 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 June 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $289 |  | $258 |  | $158 |  | $142 |  | $131 |  | $116
Retail - commercial | 196 |  | 175 |  | 127 |  | 115 |  | 69 |  | 60
Retail - industrial | 244 |  | 210 |  | 136 |  | 116 |  | 108 |  | 94
Wholesale | 54 |  | 47 |  | 16 |  | 15 |  | 38 |  | 32
Bulk power and other | 29 |  | 27 |  | 5 |  | 14 |  | 24 |  | 13
Total Electric Utility | 812 |  | 717 |  | 442 |  | 402 |  | 370 |  | 315
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 51 |  | 39 |  | 28 |  | 24 |  | 23 |  | 15
Retail - commercial | 27 |  | 19 |  | 14 |  | 12 |  | 13 |  | 7
Retail - industrial | 3 |  | 3 |  | 2 |  | 2 |  | 1 |  | 1
Transportation/other | 13 |  | 8 |  | 8 |  | 5 |  | 5 |  | 3
Total Gas Utility | 94 |  | 69 |  | 52 |  | 43 |  | 42 |  | 26
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 11 |  | 9 |  | 11 |  | 9 |  | — |  | —
Other utility | 2 |  | 1 |  | 1 |  | 1 |  | 1 |  | —
Total Other Utility | 13 |  | 10 |  | 12 |  | 10 |  | 1 |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 24 |  | 21 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 24 |  | 21 |  | — |  | — |  | — |  | —
Total revenues | $943 |  | $817 |  | $506 |  | $455 |  | $413 |  | $341
| Alliant Energy |  | IPL |  | WPL
Six Months Ended June 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $581 |  | $520 |  | $308 |  | $281 |  | $273 |  | $239
Retail - commercial | 386 |  | 347 |  | 246 |  | 225 |  | 140 |  | 122
Retail - industrial | 453 |  | 412 |  | 246 |  | 228 |  | 207 |  | 184
Wholesale | 101 |  | 87 |  | 31 |  | 26 |  | 70 |  | 61
Bulk power and other | 65 |  | 52 |  | 12 |  | 28 |  | 53 |  | 24
Total Electric Utility | 1,586 |  | 1,418 |  | 843 |  | 788 |  | 743 |  | 630
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 210 |  | 138 |  | 113 |  | 76 |  | 97 |  | 62
Retail - commercial | 109 |  | 72 |  | 54 |  | 39 |  | 55 |  | 33
Retail - industrial | 11 |  | 8 |  | 7 |  | 5 |  | 4 |  | 3
Transportation/other | 26 |  | 21 |  | 17 |  | 14 |  | 9 |  | 7
Total Gas Utility | 356 |  | 239 |  | 191 |  | 134 |  | 165 |  | 105
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 20 |  | 18 |  | 20 |  | 18 |  | — |  | —
Other utility | 3 |  | 5 |  | 2 |  | 4 |  | 1 |  | 1
Total Other Utility | 23 |  | 23 |  | 22 |  | 22 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 47 |  | 38 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 47 |  | 38 |  | — |  | — |  | — |  | —
Total revenues | $2,012 |  | $1,718 |  | $1,056 |  | $944 |  | $909 |  | $736
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 June 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $289 |  | $258 |  | $158 |  | $142 |  | $131 |  | $116
Retail - commercial | 196 |  | 175 |  | 127 |  | 115 |  | 69 |  | 60
Retail - industrial | 244 |  | 210 |  | 136 |  | 116 |  | 108 |  | 94
Wholesale | 54 |  | 47 |  | 16 |  | 15 |  | 38 |  | 32
Bulk power and other | 29 |  | 27 |  | 5 |  | 14 |  | 24 |  | 13
Total Electric Utility | 812 |  | 717 |  | 442 |  | 402 |  | 370 |  | 315
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 51 |  | 39 |  | 28 |  | 24 |  | 23 |  | 15
Retail - commercial | 27 |  | 19 |  | 14 |  | 12 |  | 13 |  | 7
Retail - industrial | 3 |  | 3 |  | 2 |  | 2 |  | 1 |  | 1
Transportation/other | 13 |  | 8 |  | 8 |  | 5 |  | 5 |  | 3
Total Gas Utility | 94 |  | 69 |  | 52 |  | 43 |  | 42 |  | 26
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 11 |  | 9 |  | 11 |  | 9 |  | — |  | —
Other utility | 2 |  | 1 |  | 1 |  | 1 |  | 1 |  | —
Total Other Utility | 13 |  | 10 |  | 12 |  | 10 |  | 1 |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 24 |  | 21 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 24 |  | 21 |  | — |  | — |  | — |  | —
Total revenues | $943 |  | $817 |  | $506 |  | $455 |  | $413 |  | $341
| Alliant Energy |  | IPL |  | WPL
Six Months Ended June 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $581 |  | $520 |  | $308 |  | $281 |  | $273 |  | $239
Retail - commercial | 386 |  | 347 |  | 246 |  | 225 |  | 140 |  | 122
Retail - industrial | 453 |  | 412 |  | 246 |  | 228 |  | 207 |  | 184
Wholesale | 101 |  | 87 |  | 31 |  | 26 |  | 70 |  | 61
Bulk power and other | 65 |  | 52 |  | 12 |  | 28 |  | 53 |  | 24
Total Electric Utility | 1,586 |  | 1,418 |  | 843 |  | 788 |  | 743 |  | 630
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 210 |  | 138 |  | 113 |  | 76 |  | 97 |  | 62
Retail - commercial | 109 |  | 72 |  | 54 |  | 39 |  | 55 |  | 33
Retail - industrial | 11 |  | 8 |  | 7 |  | 5 |  | 4 |  | 3
Transportation/other | 26 |  | 21 |  | 17 |  | 14 |  | 9 |  | 7
Total Gas Utility | 356 |  | 239 |  | 191 |  | 134 |  | 165 |  | 105
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 20 |  | 18 |  | 20 |  | 18 |  | — |  | —
Other utility | 3 |  | 5 |  | 2 |  | 4 |  | 1 |  | 1
Total Other Utility | 23 |  | 23 |  | 22 |  | 22 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 47 |  | 38 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 47 |  | 38 |  | — |  | — |  | — |  | —
Total revenues | $2,012 |  | $1,718 |  | $1,056 |  | $944 |  | $909 |  | $736
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 June 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $289 |  | $258 |  | $158 |  | $142 |  | $131 |  | $116
Retail - commercial | 196 |  | 175 |  | 127 |  | 115 |  | 69 |  | 60
Retail - industrial | 244 |  | 210 |  | 136 |  | 116 |  | 108 |  | 94
Wholesale | 54 |  | 47 |  | 16 |  | 15 |  | 38 |  | 32
Bulk power and other | 29 |  | 27 |  | 5 |  | 14 |  | 24 |  | 13
Total Electric Utility | 812 |  | 717 |  | 442 |  | 402 |  | 370 |  | 315
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 51 |  | 39 |  | 28 |  | 24 |  | 23 |  | 15
Retail - commercial | 27 |  | 19 |  | 14 |  | 12 |  | 13 |  | 7
Retail - industrial | 3 |  | 3 |  | 2 |  | 2 |  | 1 |  | 1
Transportation/other | 13 |  | 8 |  | 8 |  | 5 |  | 5 |  | 3
Total Gas Utility | 94 |  | 69 |  | 52 |  | 43 |  | 42 |  | 26
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 11 |  | 9 |  | 11 |  | 9 |  | — |  | —
Other utility | 2 |  | 1 |  | 1 |  | 1 |  | 1 |  | —
Total Other Utility | 13 |  | 10 |  | 12 |  | 10 |  | 1 |  | —
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 24 |  | 21 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 24 |  | 21 |  | — |  | — |  | — |  | —
Total revenues | $943 |  | $817 |  | $506 |  | $455 |  | $413 |  | $341
| Alliant Energy |  | IPL |  | WPL
Six Months Ended June 30 | 2022 |  | 2021 |  | 2022 |  | 2021 |  | 2022 |  | 2021
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $581 |  | $520 |  | $308 |  | $281 |  | $273 |  | $239
Retail - commercial | 386 |  | 347 |  | 246 |  | 225 |  | 140 |  | 122
Retail - industrial | 453 |  | 412 |  | 246 |  | 228 |  | 207 |  | 184
Wholesale | 101 |  | 87 |  | 31 |  | 26 |  | 70 |  | 61
Bulk power and other | 65 |  | 52 |  | 12 |  | 28 |  | 53 |  | 24
Total Electric Utility | 1,586 |  | 1,418 |  | 843 |  | 788 |  | 743 |  | 630
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 210 |  | 138 |  | 113 |  | 76 |  | 97 |  | 62
Retail - commercial | 109 |  | 72 |  | 54 |  | 39 |  | 55 |  | 33
Retail - industrial | 11 |  | 8 |  | 7 |  | 5 |  | 4 |  | 3
Transportation/other | 26 |  | 21 |  | 17 |  | 14 |  | 9 |  | 7
Total Gas Utility | 356 |  | 239 |  | 191 |  | 134 |  | 165 |  | 105
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 20 |  | 18 |  | 20 |  | 18 |  | — |  | —
Other utility | 3 |  | 5 |  | 2 |  | 4 |  | 1 |  | 1
Total Other Utility | 23 |  | 23 |  | 22 |  | 22 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 47 |  | 38 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 47 |  | 38 |  | — |  | — |  | — |  | —
Total revenues | $2,012 |  | $1,718 |  | $1,056 |  | $944 |  | $909 |  | $736

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