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Investments (Tables) | 9 Months Ended
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Sep. 30, 2024
Schedule of Equity Method Investments [Line Items] |
Unconsolidated Equity Investments | Alliant Energy’s equity (income) loss from unconsolidated investments accounted for under the equity method of accounting for the three and nine months ended September 30 was as follows (in millions):
| Three Months |  | Nine Months
| 2024 |  | 2023 |  | 2024 |  | 2023
ATC Holdings | ($13) |  | ($12) |  | ($38) |  | ($37)
Other | (1) |  | (2) |  | (6) |  | (8)
| ($14) |  | ($14) |  | ($44) |  | ($45)

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