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Redeemable Noncontrolling Interests - Narrative (Details) - shares	1 Months Ended	9 Months Ended
	Oct. 31, 2021	Sep. 30, 2021	Sep. 30, 2020
Consolidated Real Estate Venture
Noncontrolling Interest [Line Items]
Ownership interest by parent, threshold for capital contributions to cease		97.00%
OP Units
Noncontrolling Interest [Line Items]
Conversion of common limited partnership units to common shares	20,953	829,107	1,100,000
JBG Smith, LP
Noncontrolling Interest [Line Items]
Ownership interest by parent		90.80%
JBG Smith, LP | OP Units
Noncontrolling Interest [Line Items]
Units outstanding		13,100,000
Ownership interest by parent		9.20%
Consolidated Real Estate Venture
Noncontrolling Interest [Line Items]
Ownership interest by parent		96.00%

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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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