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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($) $ in Billions | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Contingency [Line Items] |  |
Tax basis of assets, cost for income tax purposes | $ 3.0 | $ 3.2
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |
Income Tax Contingency [Line Items] |  |
Tax basis of assets, cost for income tax purposes | $ 3.0 | $ 3.2

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- Definition Cost basis of real estate investments for federal income tax purposes for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 28 -Footnote 6 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 970 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479438/970-360-S99-1 + Details
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