Aggregate dividends paid during the period for each share of common stock outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586

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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.

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Stockholders' Equity / Partners' Capital Dividends / Distributions (Details) - $ / shares	Oct. 29, 2021	Jul. 30, 2021	Apr. 30, 2021	Feb. 16, 2021	Jan. 28, 2021	Nov. 16, 2020	Oct. 30, 2020	Aug. 17, 2020	Jul. 31, 2020	May 15, 2020	Apr. 30, 2020	Feb. 18, 2020	Jan. 30, 2020	Nov. 15, 2019	Oct. 31, 2019	Aug. 15, 2019	Jul. 31, 2019	May 15, 2019	Apr. 30, 2019	Feb. 15, 2019	Jan. 30, 2019	Dec. 20, 2021
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit																						$ 0.98
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	$ 0.98	$ 0.98	$ 0.98		$ 0.98		$ 0.98		$ 0.98		$ 0.98		$ 0.98		$ 0.95		$ 0.95		$ 0.95		$ 0.95
Boston Properties Limited Partnership
Dividends / Distributions [Line Items]
Dividends Payable, Amount Per Share / Unit																						$ 0.98
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid	$ 0.98	$ 0.98	$ 0.98		$ 0.98		$ 0.98		$ 0.98		$ 0.98		$ 0.98		$ 0.95		$ 0.95		$ 0.95		$ 0.95
Series B Cumulative Redeemable Preferred Stock / Unit [Member]
Dividends / Distributions [Line Items]
Common Stock / Unit, Dividends / Distributions, Per Share / Unit, Cash Paid				$ 32.8125		$ 32.8125		$ 32.8125		$ 32.8125		$ 32.8125		$ 32.8125		$ 32.8125		$ 32.8125		$ 32.8125