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Stock Option and Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 01, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 20, 2021 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Period |  | 4 years |  |  |  |
Beginning outstanding, shares |  | 103,641 | 103,641 | 351,561 |  | 395,353
Weighted Average Exercise Price |  | $ 97.01 | $ 97.01 | $ 96.97 |  | $ 96.37
MYLTIP 2022 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award | The 2022 MYLTIP awards consist of two, equally weighted (50% each) components that utilize BXP’s TSR over a three-year measurement period as the performance metric. The first component of the 2022 MYLTIP represents one-half (50%) of the target grant-date value of the award. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on BXP’s three-year, annualized relative TSR performance compared to a custom index of peer companies. Under this component, 100% of the target number of LTIP Units will be earned if BXP’s TSR equals the custom index TSR; for relative TSR performance between -1,000 basis points and +1,000 basis points, the number of LTIP Units earned will be determined using linear interpolation.The second component represents the remaining one-half (50%) of the target grant-date value of the 2022 MYLTIP. The number of LTIP Units that can be earned under this component ranges from zero to 200% of the target number of LTIP Units, based on BXP’s non-annualized, cumulative absolute TSR during the three-year performance period. Under this component, 100% of the target number of LTIP Units will be earned if BXP achieves an absolute TSR equal to +1,000 basis points; if BXP’s absolute TSR is greater than -4,000 basis points but less than +6,000 basis points, then the number of LTIP Units earned will be determined using linear interpolation. |  |  |  |  |
Distributions percent before measurement date | 10.00% |  |  |  |  |
Vesting Period | 3 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | Earned awards (if any) will vest 100% on January 31, 2025, but may not be converted, redeemed, sold or otherwise transferred for one additional year thereafter. Vesting will be accelerated in the event of a change in control, termination of employment by BXP without cause, or termination of employment by the award recipient for good reason, death, disability or retirement. If there is a change of control prior to January 31, 2025, earned awards will be calculated based on TSR performance up to the date of the change of control. |  |  |  |  |
Value of MYLTIP Awards | $ 17.3 |  |  |  |  |
MYLTIP 2022 | Boston Properties Limited Partnership |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares issued |  | 254,061 |  |  |  |
MYLTIP 2021 | Boston Properties Limited Partnership |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares issued |  |  | 352,021 |  |  |
Employee Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock available for issuance |  | 250,000 |  |  |  |
Employee discount |  | 85.00% |  |  |  |
Number of shares issued |  | 9,813 | 9,846 | 7,195 |  |
Weighted Average Price of Shares Purchased |  | $ 87.30 | $ 89.73 | $ 90.53 |  |
stock option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 0 | 0 | 0 |  |
MYLTIP 2020 [Member] | Boston Properties Limited Partnership |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares issued |  |  |  | 203,278 |  |
Minimum [Member] | MYLTIP 2022 | Boston Properties Limited Partnership |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock available for issuance | 0 |  |  |  |  |
Maximum [Member] | MYLTIP 2022 | Boston Properties Limited Partnership |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock available for issuance | 254,061 |  |  |  |  |
Maximum [Member] | 2021 Stock Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock available for issuance |  |  |  |  | 5,400,000 |
Target | MYLTIP 2022 | Boston Properties Limited Partnership |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock available for issuance | 127,031 |  |  |  |  |

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