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Noncontrolling Interests (Narrative) (Details) - Boston Properties Limited Partnership | Dec. 31, 2020 shares
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OP Units [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 16,037,121
LTIP Units [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 1,336,115
OPP Units 2012 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 105,080
MYLTIP 2013 |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 64,468
MYLTIP 2014 |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 23,100
MYLTIP 2015 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 24,966
MYLTIP 2016 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 89,791
MYLTIP 2017 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 116,078
MYLTIP 2018 |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 336,195
MYLTIP 2019 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 219,916
MYLTIP 2020 [Member] |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |
Noncontrolling Interest, Outstanding | 203,278

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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