Investments (Tables)

9 Months Ended

Sep. 30, 2021

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 Months		Nine Months
	2021	2020	2021	2020
ATC Holdings	($12)	($11)	($34)	($36)
Other	(1)	(4)	(13)	(10)
	($13)	($15)	($47)	($46)