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Investments in and Advances to Unconsolidated Joint Ventures - Narrative (Details) $ in Millions | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2024 USD ($) property | Sep. 30, 2025 USD ($) bbl property | Sep. 30, 2024 USD ($) | Feb. 28, 2025 USD ($) | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain on deconsolidation |  |  | $ 78 |  |
Fair Value, Inputs, Level 3 | Weighted Average |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment, measurement input | bbl |  | 0.0795 |  |  |
Fair Value, Inputs, Level 3 | Terminal Capitalization Rate |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment, measurement input | bbl |  | 0.0650 |  |  |
Fair Value, Inputs, Level 3 | Discount Rate | Minimum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment, measurement input | bbl |  | 0.0750 |  |  |
Fair Value, Inputs, Level 3 | Discount Rate | Maximum |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment, measurement input | bbl |  | 0.0875 |  |  |
South San Francisco JVs |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment ownership (as a percent) |  | 30.00% |  |  |
Other-than-temporary impairments charges |  | $ 169 |  |  |
South San Francisco JVs | Lab Buildings |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment ownership (as a percent) |  | 70.00% |  |  |
Property count | property |  | 7 |  |  |
Needham Land Parcel JV |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other-than-temporary impairments charges |  | $ 7 |  |  |
Needham Land Parcel JV | Lab Buildings |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment ownership (as a percent) |  | 38.00% |  |  | 38.00%
Property count | property |  | 0 |  |  |
HQ Point Investment |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity investment, aggregate cost |  |  |  | $ 50 |
HQ Point Investment | Lab Buildings |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Payments to acquire equity investments |  | $ 45 |  |  |
Callan Ridge Joint Venture | Callan Ridge Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment ownership (as a percent) | 35.00% |  |  |  |
Callan Ridge Joint Venture | Lab Buildings |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Property count | property | 2 |  |  |  |
Callan Ridge Joint Venture | Lab Buildings | Callan Ridge Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment ownership (as a percent) | 65.00% |  |  |  |
Cash proceeds | $ 128 |  |  |  |

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