XML 50 R30.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Revenues (Tables) | 6 Months Ended
--- | ---
Jun. 30, 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 June 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $291 |  | $284 |  | $151 |  | $151 |  | $140 |  | $133
Retail - commercial | 191 |  | 201 |  | 118 |  | 129 |  | 73 |  | 72
Retail - industrial | 237 |  | 245 |  | 118 |  | 130 |  | 119 |  | 115
Wholesale | 43 |  | 49 |  | 13 |  | 14 |  | 30 |  | 35
Bulk power and other | 27 |  | 20 |  | 4 |  | 7 |  | 23 |  | 13
Total Electric Utility | 789 |  | 799 |  | 404 |  | 431 |  | 385 |  | 368
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 38 |  | 42 |  | 22 |  | 24 |  | 16 |  | 18
Retail - commercial | 19 |  | 22 |  | 11 |  | 12 |  | 8 |  | 10
Retail - industrial | 2 |  | 3 |  | 1 |  | 2 |  | 1 |  | 1
Transportation/other | 10 |  | 10 |  | 6 |  | 6 |  | 4 |  | 4
Total Gas Utility | 69 |  | 77 |  | 40 |  | 44 |  | 29 |  | 33
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 11 |  | 9 |  | 11 |  | — |  | —
Other utility | 1 |  | 2 |  | — |  | 1 |  | 1 |  | 1
Total Other Utility | 10 |  | 13 |  | 9 |  | 12 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 26 |  | 23 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 26 |  | 23 |  | — |  | — |  | — |  | —
Total revenues | $894 |  | $912 |  | $453 |  | $487 |  | $415 |  | $402
| Alliant Energy |  | IPL |  | WPL
Six Months Ended June 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $588 |  | $569 |  | $301 |  | $294 |  | $287 |  | $275
Retail - commercial | 377 |  | 385 |  | 232 |  | 241 |  | 145 |  | 144
Retail - industrial | 460 |  | 460 |  | 229 |  | 236 |  | 231 |  | 224
Wholesale | 89 |  | 95 |  | 26 |  | 26 |  | 63 |  | 69
Bulk power and other | 66 |  | 58 |  | 7 |  | 22 |  | 59 |  | 36
Total Electric Utility | 1,580 |  | 1,567 |  | 795 |  | 819 |  | 785 |  | 748
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 165 |  | 210 |  | 90 |  | 117 |  | 75 |  | 93
Retail - commercial | 80 |  | 110 |  | 41 |  | 56 |  | 39 |  | 54
Retail - industrial | 6 |  | 9 |  | 4 |  | 6 |  | 2 |  | 3
Transportation/other | 22 |  | 24 |  | 13 |  | 15 |  | 9 |  | 9
Total Gas Utility | 273 |  | 353 |  | 148 |  | 194 |  | 125 |  | 159
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 20 |  | 22 |  | 20 |  | 22 |  | — |  | —
Other utility | 4 |  | 3 |  | 3 |  | 2 |  | 1 |  | 1
Total Other Utility | 24 |  | 25 |  | 23 |  | 24 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 48 |  | 45 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 48 |  | 45 |  | — |  | — |  | — |  | —
Total revenues | $1,925 |  | $1,990 |  | $966 |  | $1,037 |  | $911 |  | $908
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 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $291 |  | $284 |  | $151 |  | $151 |  | $140 |  | $133
Retail - commercial | 191 |  | 201 |  | 118 |  | 129 |  | 73 |  | 72
Retail - industrial | 237 |  | 245 |  | 118 |  | 130 |  | 119 |  | 115
Wholesale | 43 |  | 49 |  | 13 |  | 14 |  | 30 |  | 35
Bulk power and other | 27 |  | 20 |  | 4 |  | 7 |  | 23 |  | 13
Total Electric Utility | 789 |  | 799 |  | 404 |  | 431 |  | 385 |  | 368
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 38 |  | 42 |  | 22 |  | 24 |  | 16 |  | 18
Retail - commercial | 19 |  | 22 |  | 11 |  | 12 |  | 8 |  | 10
Retail - industrial | 2 |  | 3 |  | 1 |  | 2 |  | 1 |  | 1
Transportation/other | 10 |  | 10 |  | 6 |  | 6 |  | 4 |  | 4
Total Gas Utility | 69 |  | 77 |  | 40 |  | 44 |  | 29 |  | 33
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 11 |  | 9 |  | 11 |  | — |  | —
Other utility | 1 |  | 2 |  | — |  | 1 |  | 1 |  | 1
Total Other Utility | 10 |  | 13 |  | 9 |  | 12 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 26 |  | 23 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 26 |  | 23 |  | — |  | — |  | — |  | —
Total revenues | $894 |  | $912 |  | $453 |  | $487 |  | $415 |  | $402
| Alliant Energy |  | IPL |  | WPL
Six Months Ended June 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $588 |  | $569 |  | $301 |  | $294 |  | $287 |  | $275
Retail - commercial | 377 |  | 385 |  | 232 |  | 241 |  | 145 |  | 144
Retail - industrial | 460 |  | 460 |  | 229 |  | 236 |  | 231 |  | 224
Wholesale | 89 |  | 95 |  | 26 |  | 26 |  | 63 |  | 69
Bulk power and other | 66 |  | 58 |  | 7 |  | 22 |  | 59 |  | 36
Total Electric Utility | 1,580 |  | 1,567 |  | 795 |  | 819 |  | 785 |  | 748
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 165 |  | 210 |  | 90 |  | 117 |  | 75 |  | 93
Retail - commercial | 80 |  | 110 |  | 41 |  | 56 |  | 39 |  | 54
Retail - industrial | 6 |  | 9 |  | 4 |  | 6 |  | 2 |  | 3
Transportation/other | 22 |  | 24 |  | 13 |  | 15 |  | 9 |  | 9
Total Gas Utility | 273 |  | 353 |  | 148 |  | 194 |  | 125 |  | 159
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 20 |  | 22 |  | 20 |  | 22 |  | — |  | —
Other utility | 4 |  | 3 |  | 3 |  | 2 |  | 1 |  | 1
Total Other Utility | 24 |  | 25 |  | 23 |  | 24 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 48 |  | 45 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 48 |  | 45 |  | — |  | — |  | — |  | —
Total revenues | $1,925 |  | $1,990 |  | $966 |  | $1,037 |  | $911 |  | $908
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 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $291 |  | $284 |  | $151 |  | $151 |  | $140 |  | $133
Retail - commercial | 191 |  | 201 |  | 118 |  | 129 |  | 73 |  | 72
Retail - industrial | 237 |  | 245 |  | 118 |  | 130 |  | 119 |  | 115
Wholesale | 43 |  | 49 |  | 13 |  | 14 |  | 30 |  | 35
Bulk power and other | 27 |  | 20 |  | 4 |  | 7 |  | 23 |  | 13
Total Electric Utility | 789 |  | 799 |  | 404 |  | 431 |  | 385 |  | 368
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 38 |  | 42 |  | 22 |  | 24 |  | 16 |  | 18
Retail - commercial | 19 |  | 22 |  | 11 |  | 12 |  | 8 |  | 10
Retail - industrial | 2 |  | 3 |  | 1 |  | 2 |  | 1 |  | 1
Transportation/other | 10 |  | 10 |  | 6 |  | 6 |  | 4 |  | 4
Total Gas Utility | 69 |  | 77 |  | 40 |  | 44 |  | 29 |  | 33
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 9 |  | 11 |  | 9 |  | 11 |  | — |  | —
Other utility | 1 |  | 2 |  | — |  | 1 |  | 1 |  | 1
Total Other Utility | 10 |  | 13 |  | 9 |  | 12 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 26 |  | 23 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 26 |  | 23 |  | — |  | — |  | — |  | —
Total revenues | $894 |  | $912 |  | $453 |  | $487 |  | $415 |  | $402
| Alliant Energy |  | IPL |  | WPL
Six Months Ended June 30 | 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Electric Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | $588 |  | $569 |  | $301 |  | $294 |  | $287 |  | $275
Retail - commercial | 377 |  | 385 |  | 232 |  | 241 |  | 145 |  | 144
Retail - industrial | 460 |  | 460 |  | 229 |  | 236 |  | 231 |  | 224
Wholesale | 89 |  | 95 |  | 26 |  | 26 |  | 63 |  | 69
Bulk power and other | 66 |  | 58 |  | 7 |  | 22 |  | 59 |  | 36
Total Electric Utility | 1,580 |  | 1,567 |  | 795 |  | 819 |  | 785 |  | 748
Gas Utility: |  |  |  |  |  |  |  |  |  |  |
Retail - residential | 165 |  | 210 |  | 90 |  | 117 |  | 75 |  | 93
Retail - commercial | 80 |  | 110 |  | 41 |  | 56 |  | 39 |  | 54
Retail - industrial | 6 |  | 9 |  | 4 |  | 6 |  | 2 |  | 3
Transportation/other | 22 |  | 24 |  | 13 |  | 15 |  | 9 |  | 9
Total Gas Utility | 273 |  | 353 |  | 148 |  | 194 |  | 125 |  | 159
Other Utility: |  |  |  |  |  |  |  |  |  |  |
Steam | 20 |  | 22 |  | 20 |  | 22 |  | — |  | —
Other utility | 4 |  | 3 |  | 3 |  | 2 |  | 1 |  | 1
Total Other Utility | 24 |  | 25 |  | 23 |  | 24 |  | 1 |  | 1
Non-Utility and Other: |  |  |  |  |  |  |  |  |  |  |
Travero and other | 48 |  | 45 |  | — |  | — |  | — |  | —
Total Non-Utility and Other | 48 |  | 45 |  | — |  | — |  | — |  | —
Total revenues | $1,925 |  | $1,990 |  | $966 |  | $1,037 |  | $911 |  | $908

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479777/606-10-55-91 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479777/606-10-55-91 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479777/606-10-55-91 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479777/606-10-55-91 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479777/606-10-55-91 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479777/606-10-55-91 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479777/606-10-55-91 + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
Name: | us-gaap_DisaggregationOfRevenueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=lnt_IplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lnt_WplMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |