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Investments | 6 Months Ended
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Jun. 30, 2022
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 six months ended June 30 was as follows (in millions):
| Three Months |  | Six Months
| 2022 |  | 2021 |  | 2022 |  | 2021
ATC Holdings | ($11) |  | ($11) |  | ($23) |  | ($22)
Other | (5) |  | (8) |  | (9) |  | (12)
| ($16) |  | ($19) |  | ($32) |  | ($34)

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