Consolidated Statements of Partners' Equity (Parenthetical) - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
BRANDYWINE OPERATING PARTNERSHIP, L.P. \| General Partner Capital
Distributions to general partnership unitholders (USD per share)	$ 0.76	$ 0.76	$ 0.73

Cash dividends declared or paid to each outstanding general partnership unit during the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration