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Redeemable Noncontrolling Interests - Narrative (Details) - shares
2 Months Ended 12 Months Ended
Feb. 22, 2022
Dec. 31, 2021
Dec. 31, 2020
OP Units [Member]      
Noncontrolling Interest [Line Items]      
Conversion of common limited partnership units to common shares   906,126 1,300,000
Subsequent Event [Member] | OP Units [Member]      
Noncontrolling Interest [Line Items]      
Conversion of common limited partnership units to common shares 205,455    
JBG Smith, LP      
Noncontrolling Interest [Line Items]      
Ownership interest by parent   89.50%  
JBG Smith, LP | OP Units [Member]      
Noncontrolling Interest [Line Items]      
Units outstanding   14,900,000  
Ownership interest by parent   10.50%  
Consolidated Real Estate Venture      
Noncontrolling Interest [Line Items]      
Ownership interest by parent   96.00%  
Consolidated Real Estate Venture | Maximum      
Noncontrolling Interest [Line Items]      
Ownership interest by parent   97.00%