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Investments
 9 Months Ended
Sep. 30, 2024
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 MonthsNine Months
2024202320242023
ATC Holdings($13)($12)($38)($37)
Other(1)(2)(6)(8)
($14)($14)($44)($45)