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Investments | 9 Months Ended
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Sep. 30, 2023
Schedule of Equity Method Investments [Line Items] |
Investments | INVESTMENTS 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
| 2023 |  | 2022 |  | 2023 |  | 2022
ATC Holdings | ($12) |  | ($7) |  | ($37) |  | ($29)
Other | (2) |  | 2 |  | (8) |  | (8)
| ($14) |  | ($5) |  | ($45) |  | ($37)

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