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Variable Interest Entities (Details) | Dec. 31, 2021
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Variable Interest Entity [Line Items] |
Number of VIEs | 6
Number of VIEs - Total | 7
Commercial Real Estate Properties [Member] |
Variable Interest Entity [Line Items] |
Number of VIEs | 5

X
- Definition Number of VIEs - consolidated + References No definition available. + Details
Name: | bxp_NumberofVIEs
Namespace Prefix: | bxp_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of VIEs - Total + References No definition available. + Details
Name: | bxp_NumberofVIEsTotal
Namespace Prefix: | bxp_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |