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Common Equity (Tables)
 12 Months Ended
Dec. 31, 2022
Schedule of Common Equity [Line Items]  
Common Stock Activity A summary of Alliant Energy’s common stock activity was as follows:
202220212020
Shares outstanding, January 1250,474,529 249,868,415 245,022,800 
Equity forward agreements— — 4,275,127 
Shareowner Direct Plan437,669 492,565 472,283 
Equity-based compensation plans222,768 113,549 98,205 
Shares outstanding, December 31251,134,966 250,474,529 249,868,415