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Investments (Tables)
 9 Months Ended
Sep. 30, 2024
Schedule of Equity Method Investments [Line Items]  
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)