Annual report pursuant to Section 13 and 15(d)

Equity - COPT and Subsidiaries (Details)

v3.22.4
Equity - COPT and Subsidiaries (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
May 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Common Shares        
Number of common shares for each converted common unit (in shares)   1 1 1
Number of operating partnerships units converted into common shares (in units)   0 8,054 14,009
Dividends declared per common share (in dollars per share)   $ 1.10 $ 1.10 $ 1.10
Preferred Shares        
Preferred Stock        
Number of preferred shares authorized   25,000,000    
Number of preferred shares of beneficial interest authorized (in dollars per share)   $ 0.01    
2022 ATM Program | Common Shares        
Common Shares        
At-market-stock, offering program established, aggregate value $ 300      
Shares issued to the public (in shares)   0