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Common Equity (Tables)
 12 Months Ended
Dec. 31, 2021
Schedule of Common Equity [Line Items]  
Common Stock Activity A summary of Alliant Energy’s common stock activity was as follows:
202120202019
Shares outstanding, January 1249,868,415 245,022,800 236,063,279 
Equity forward agreements— 4,275,127 8,358,973 
Shareowner Direct Plan492,565 472,283 501,808 
Equity-based compensation plans113,549 98,205 101,478 
Other— — (2,738)
Shares outstanding, December 31250,474,529 249,868,415 245,022,800