Quarterly report pursuant to Section 13 or 15(d)

Equity (Details)

v3.20.1
Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Class of Stock [Line Items]      
Conversion of common units to common shares (in units/shares)   12,009 5,500
Dividends declared per share (in usd per share)   $ 0.275 $ 0.275
Common Shares | 2018 Common Stock Issued to Public Under At-the-Market Program      
Class of Stock [Line Items]      
At the market, offering program established, aggregate value $ 300    
Corporate Office Properties, L.P.      
Class of Stock [Line Items]      
Dividends declared per share (in usd per share)   $ 0.275 $ 0.275