Investments (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of Equity Method Investments [Line Items]

Unconsolidated Equity Investments

Alliant Energy’s unconsolidated investments accounted for under the equity method of accounting are as follows (in millions):

	Ownership Interest at	Carrying Value at December 31,		Equity (Income) / Loss
	December 31, 2021	2021	2020	2021	2020	2019
ATC Holdings	16%, 20%	$338	$331	($43)	($47)	($45)
Non-utility wind farm in Oklahoma	50%	99	103	(4)	(8)	(5)
Corporate venture investments	Various	52	31	(13)	(4)	(1)
Other	Various	19	11	(2)	(2)	(2)
		$508	$476	($62)	($61)	($53)

Summary Financial Information

Summary aggregate financial information from the financial statements of these holdings is as follows (in millions):

	Alliant Energy
	2021	2020	2019
Revenues	$802	$801	$783
Operating income	357	376	359
Net income	358	343	340
As of December 31:
Current assets	112	121
Non-current assets	7,036	6,388
Current liabilities	455	317
Non-current liabilities	3,110	2,997
Noncontrolling interest	247	192