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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 |  |

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