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Redeemable Noncontrolling Interests - Narrative (Details) - shares	1 Months Ended	9 Months Ended
	Feb. 28, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2022
OP Units
Redeemable Noncontrolling Interests
Redemption of common limited partnership units to common shares		827,012	2,100,000
JBG Smith, LP
Redeemable Noncontrolling Interests
Ownership interest by parent		85.80%
JBG Smith, LP | OP Units
Redeemable Noncontrolling Interests
Units outstanding		13,900,000
Ownership interest by parent		14.20%
Consolidated Real Estate Venture
Redeemable Noncontrolling Interests
Ownership interest by parent		100.00%		99.70%
Interest redeemed	0.30%

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- Definition

The number of units or equivalent units outstanding for all classes.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

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