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Noncontrolling Interests Common Units Distributions (Details) - Boston Properties Limited Partnership - $ / shares
Jul. 31, 2020
Apr. 30, 2020
Jan. 30, 2020
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Jan. 30, 2019
Sep. 18, 2020
Dividends Payable [Line Items]                
Distributions Declared To OP And LTIP Units Per Unit               $ 0.98
Distributions Declared To MYLTIP Units Per Unit               $ 0.098
Distributions made to OP and LTIP units per unit (in dollars per share) $ 0.98 $ 0.98 $ 0.98 $ 0.95 $ 0.95 $ 0.95 $ 0.95  
Distributions Made To MYLTIP Units Per Unit $ 0.098 $ 0.098 $ 0.098 $ 0.095 $ 0.095 $ 0.095 $ 0.095