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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Billions | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Contingency [Line Items] |  |
Tax basis of assets, cost for income tax purposes | $ 2.9 | $ 3.0
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |
Income Tax Contingency [Line Items] |  |
Tax basis of assets, cost for income tax purposes | $ 2.9 | $ 3.0

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