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Organization (Details) ft² in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022 ft² Real_Estate_Properties yr shares	Dec. 31, 2021
Real Estate Properties [Line Items]
Restriction on redemption of OP units from date of issuance (years) | yr	1
One OP unit is equivalent to one share of Common Stock (in shares) | shares	1
OP unit conversion rate (in shares) | shares	1
Boston Properties Limited Partnership
Real Estate Properties [Line Items]
General and limited partnership interest in the operating partnership (percent)	89.60%	89.70%
Commercial Real Estate Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	193
Net Rentable Area (in sf) | ft²	53.7
Total Properties Under Construction [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	12
Net Rentable Area (in sf) | ft²	4.2
Total Office Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	173
Office Properties Under Construction [Member]
Real Estate Properties [Line Items]
Number of real estate properties	11
Retail Properties [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	12
Residential Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	7
Residential Properties [Member] | Construction in Progress
Real Estate Properties [Line Items]
Number of real estate properties	1
Hotel Property [ Member]
Real Estate Properties [Line Items]
Number of real estate properties	1

X

- Definition

Common Stock Conversion Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	bxp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

OP Unit Conversion Rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	bxp_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Restriction On Redemption Of OP Units From Date Of Issuance In Years

+ References

No definition available.

+ Details

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Namespace Prefix:	bxp_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net rentable area for properties owned.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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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

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X

- Details

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Namespace Prefix:
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X

- Details

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Period Type:

X

- Details

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X

- Details

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- Details

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X

- Details

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- Details

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- Details

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X

- Details

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Period Type: