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Investments | 9 Months Ended
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Sep. 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 nine months ended September 30 was as follows (in millions):
| Three Months |  | Nine Months
| 2022 |  | 2021 |  | 2022 |  | 2021
ATC Holdings | ($7) |  | ($12) |  | ($29) |  | ($34)
Other | 2 |  | (1) |  | (8) |  | (13)
| ($5) |  | ($13) |  | ($37) |  | ($47)
Refer to N ote 13(e) for discussion of a reduction in earnings recorded in the third quarter of 2022 related to a court decision, which is currently expected to reduce the base return on equity authorized for MISO transmission owners, including ATC.

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