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Noncontrolling Interests Common units distributions (Details) - Boston Properties Limited Partnership - $ / shares | Apr. 30, 2019 | Jan. 30, 2019 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 30, 2018 | Jun. 10, 2019
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Dividends Payable [Line Items] |  |  |  |  |  |
Distributions Declared To OP And LTIP Units Per Unit |  |  |  |  |  | $ 0.95
Distributions Declared To MYLTIP Units Per Unit (in dollars per unit) |  |  |  |  |  | $ 0.095
Distributions made to OP and LTIP units per unit (in dollars per unit) | $ 0.95 | $ 0.95 | $ 0.80 | $ 0.80 | $ 0.80 |
Distribution paid to MYLTIP Units (in dollars per unit) | $ 0.095 | $ 0.095 | $ 0.080 | $ 0.080 | $ 0.080 |

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