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Segments Of Business (Tables) | 9 Months Ended
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Sep. 30, 2023
Segment Reporting Information [Line Items] |
Schedule Of Segments Of Business | Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.
Alliant Energy |  |  |  |  |  |  |  |  | ATC Holdings, |  | Alliant
| Utility |  | Non-Utility, |  | Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |
Revenues | $995 |  | $47 |  | $13 |  | $1,055 |  | $22 |  | $1,077
Operating income (loss) | 319 |  | (4) |  | — |  | 315 |  | 7 |  | 322
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 277 |  | (18) |  | 259
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |
Revenues | $1,039 |  | $62 |  | $11 |  | $1,112 |  | $23 |  | $1,135
Operating income (loss) | 304 |  | (3) |  | 1 |  | 302 |  | 7 |  | 309
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 245 |  | (18) |  | 227
Alliant Energy |  |  |  |  |  |  |  |  | ATC Holdings, |  | Alliant
| Utility |  | Non-Utility, |  | Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |
Revenues | $2,562 |  | $400 |  | $38 |  | $3,000 |  | $66 |  | $3,066
Operating income | 682 |  | 48 |  | 12 |  | 742 |  | 18 |  | 760
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 598 |  | (16) |  | 582
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |
Revenues | $2,624 |  | $418 |  | $35 |  | $3,077 |  | $70 |  | $3,147
Operating income | 680 |  | 62 |  | 4 |  | 746 |  | 23 |  | 769
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 574 |  | 5 |  | 579
IPL | Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $551 |  | $31 |  | $12 |  | $594
Operating income (loss) | 171 |  | (2) |  | 4 |  | 173
Net income |  |  |  |  |  |  | 170
Three Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $596 |  | $33 |  | $11 |  | $640
Operating income (loss) | 174 |  | (3) |  | — |  | 171
Net income |  |  |  |  |  |  | 154
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $1,370 |  | $224 |  | $36 |  | $1,630
Operating income | 342 |  | 25 |  | 12 |  | 379
Net income |  |  |  |  |  |  | 331
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $1,438 |  | $224 |  | $34 |  | $1,696
Operating income | 353 |  | 33 |  | 3 |  | 389
Net income |  |  |  |  |  |  | 327
WPL | Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $444 |  | $16 |  | $1 |  | $461
Operating income (loss) | 148 |  | (2) |  | (4) |  | 142
Net income |  |  |  |  |  |  | 107
Three Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $443 |  | $29 |  | $— |  | $472
Operating income | 130 |  | — |  | 1 |  | 131
Net income |  |  |  |  |  |  | 91
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $1,192 |  | $176 |  | $2 |  | $1,370
Operating income | 340 |  | 23 |  | — |  | 363
Net income |  |  |  |  |  |  | 267
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $1,186 |  | $194 |  | $1 |  | $1,381
Operating income | 327 |  | 29 |  | 1 |  | 357
Net income |  |  |  |  |  |  | 247
IPL [Member] |
Segment Reporting Information [Line Items] |
Schedule Of Segments Of Business | Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.
Alliant Energy |  |  |  |  |  |  |  |  | ATC Holdings, |  | Alliant
| Utility |  | Non-Utility, |  | Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |
Revenues | $995 |  | $47 |  | $13 |  | $1,055 |  | $22 |  | $1,077
Operating income (loss) | 319 |  | (4) |  | — |  | 315 |  | 7 |  | 322
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 277 |  | (18) |  | 259
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |
Revenues | $1,039 |  | $62 |  | $11 |  | $1,112 |  | $23 |  | $1,135
Operating income (loss) | 304 |  | (3) |  | 1 |  | 302 |  | 7 |  | 309
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 245 |  | (18) |  | 227
Alliant Energy |  |  |  |  |  |  |  |  | ATC Holdings, |  | Alliant
| Utility |  | Non-Utility, |  | Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |
Revenues | $2,562 |  | $400 |  | $38 |  | $3,000 |  | $66 |  | $3,066
Operating income | 682 |  | 48 |  | 12 |  | 742 |  | 18 |  | 760
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 598 |  | (16) |  | 582
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |
Revenues | $2,624 |  | $418 |  | $35 |  | $3,077 |  | $70 |  | $3,147
Operating income | 680 |  | 62 |  | 4 |  | 746 |  | 23 |  | 769
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 574 |  | 5 |  | 579
IPL | Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $551 |  | $31 |  | $12 |  | $594
Operating income (loss) | 171 |  | (2) |  | 4 |  | 173
Net income |  |  |  |  |  |  | 170
Three Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $596 |  | $33 |  | $11 |  | $640
Operating income (loss) | 174 |  | (3) |  | — |  | 171
Net income |  |  |  |  |  |  | 154
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $1,370 |  | $224 |  | $36 |  | $1,630
Operating income | 342 |  | 25 |  | 12 |  | 379
Net income |  |  |  |  |  |  | 331
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $1,438 |  | $224 |  | $34 |  | $1,696
Operating income | 353 |  | 33 |  | 3 |  | 389
Net income |  |  |  |  |  |  | 327
WPL | Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $444 |  | $16 |  | $1 |  | $461
Operating income (loss) | 148 |  | (2) |  | (4) |  | 142
Net income |  |  |  |  |  |  | 107
Three Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $443 |  | $29 |  | $— |  | $472
Operating income | 130 |  | — |  | 1 |  | 131
Net income |  |  |  |  |  |  | 91
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $1,192 |  | $176 |  | $2 |  | $1,370
Operating income | 340 |  | 23 |  | — |  | 363
Net income |  |  |  |  |  |  | 267
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $1,186 |  | $194 |  | $1 |  | $1,381
Operating income | 327 |  | 29 |  | 1 |  | 357
Net income |  |  |  |  |  |  | 247
WPL [Member] |
Segment Reporting Information [Line Items] |
Schedule Of Segments Of Business | Certain financial information relating to Alliant Energy’s, IPL’s and WPL’s business segments is as follows. Intersegment revenues were not material to their respective operations.
Alliant Energy |  |  |  |  |  |  |  |  | ATC Holdings, |  | Alliant
| Utility |  | Non-Utility, |  | Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |
Revenues | $995 |  | $47 |  | $13 |  | $1,055 |  | $22 |  | $1,077
Operating income (loss) | 319 |  | (4) |  | — |  | 315 |  | 7 |  | 322
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 277 |  | (18) |  | 259
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |
Revenues | $1,039 |  | $62 |  | $11 |  | $1,112 |  | $23 |  | $1,135
Operating income (loss) | 304 |  | (3) |  | 1 |  | 302 |  | 7 |  | 309
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 245 |  | (18) |  | 227
Alliant Energy |  |  |  |  |  |  |  |  | ATC Holdings, |  | Alliant
| Utility |  | Non-Utility, |  | Energy
| Electric |  | Gas |  | Other |  | Total |  | Parent and Other |  | Consolidated
| (in millions)
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |  |  |
Revenues | $2,562 |  | $400 |  | $38 |  | $3,000 |  | $66 |  | $3,066
Operating income | 682 |  | 48 |  | 12 |  | 742 |  | 18 |  | 760
Net income (loss) attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 598 |  | (16) |  | 582
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |  |  |
Revenues | $2,624 |  | $418 |  | $35 |  | $3,077 |  | $70 |  | $3,147
Operating income | 680 |  | 62 |  | 4 |  | 746 |  | 23 |  | 769
Net income attributable to Alliant Energy common shareowners |  |  |  |  |  |  | 574 |  | 5 |  | 579
IPL | Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $551 |  | $31 |  | $12 |  | $594
Operating income (loss) | 171 |  | (2) |  | 4 |  | 173
Net income |  |  |  |  |  |  | 170
Three Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $596 |  | $33 |  | $11 |  | $640
Operating income (loss) | 174 |  | (3) |  | — |  | 171
Net income |  |  |  |  |  |  | 154
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $1,370 |  | $224 |  | $36 |  | $1,630
Operating income | 342 |  | 25 |  | 12 |  | 379
Net income |  |  |  |  |  |  | 331
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $1,438 |  | $224 |  | $34 |  | $1,696
Operating income | 353 |  | 33 |  | 3 |  | 389
Net income |  |  |  |  |  |  | 327
WPL | Electric |  | Gas |  | Other |  | Total
| (in millions)
Three Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $444 |  | $16 |  | $1 |  | $461
Operating income (loss) | 148 |  | (2) |  | (4) |  | 142
Net income |  |  |  |  |  |  | 107
Three Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $443 |  | $29 |  | $— |  | $472
Operating income | 130 |  | — |  | 1 |  | 131
Net income |  |  |  |  |  |  | 91
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |
Revenues | $1,192 |  | $176 |  | $2 |  | $1,370
Operating income | 340 |  | 23 |  | — |  | 363
Net income |  |  |  |  |  |  | 267
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |
Revenues | $1,186 |  | $194 |  | $1 |  | $1,381
Operating income | 327 |  | 29 |  | 1 |  | 357
Net income |  |  |  |  |  |  | 247

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482573/350-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-22 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-30 + Details
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