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Investments
6 Months Ended
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 MonthsSix Months
2022202120222021
ATC Holdings($11)($11)($23)($22)
Other(5)(8)(9)(12)
($16)($19)($32)($34)