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Stockholders' Equity / Partners' Capital Narrative (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 02, 2017
USD ($)
yr
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
shares
Mar. 27, 2018
$ / shares
Jun. 03, 2014
USD ($)
Class of Stock [Line Items]            
Common Stock, Shares, Outstanding   154,790,298 154,458,478      
General Partners' Capital Account, Units Outstanding (in units)   1,726,980        
Limited Partners' Capital Account, Units Outstanding (in units)   153,063,318        
Options exercised   145,088 0 6,688    
Shares of Common Stock issued in connection with redemption of an equal number of OP Units (in shares)   144,481 83,136      
ATM Program [Member]            
Class of Stock [Line Items]            
At The Market Stock Offering Program Aggregate Value Of Common Stock | $ $ 600.0         $ 600.0
At Market Stock Offering Program Maximum Length Of Sale (in years) | yr 3          
Series B Cumulative Redeemable Preferred Stock / Unit [Member]            
Class of Stock [Line Items]            
Series B, Shares Outstanding (in shares)   80,000 80,000      
Series B, Dividend Rate, Percentage   5.25%        
Series B, Liquidation Preference Per Share (dollars per share) | $ / shares   $ 2,500.00 $ 2,500   $ 2,500.00  
Depositary shares of Series B Cumulative Redeemable Preferred [Member]            
Class of Stock [Line Items]            
Series B, Shares Outstanding (in shares)   8,000,000        
Series B, Liquidation Preference Per Share (dollars per share) | $ / shares   $ 25.00     $ 25.00  
Boston Properties Limited Partnership            
Class of Stock [Line Items]            
General Partners' Capital Account, Units Outstanding (in units)   1,726,980 1,722,336      
Limited Partners' Capital Account, Units Outstanding (in units)   153,063,318 152,736,142      
Boston Properties Limited Partnership | Series B Cumulative Redeemable Preferred Stock / Unit [Member]            
Class of Stock [Line Items]            
Series B, Shares Outstanding (in shares)   80,000 80,000      
Series B, Liquidation Preference Per Share (dollars per share) | $ / shares   $ 2,500 $ 2,500