XML 29 R9.htm IDEA: XBRL DOCUMENT v3.20.2
Investments
 9 Months Ended
Sep. 30, 2020
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 Months
 
Nine Months
 
2020
 
2019
 
2020
 
2019
ATC Holdings

($11
)
 

($11
)
 

($36
)
 

($30
)
Non-utility wind farm in Oklahoma
(2
)
 
—

 
(6
)
 
(3
)
Other
(2
)
 
(1
)
 
(4
)
 
(2
)
 

($15
)
 

($12
)
 

($46
)
 

($35
)