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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Feb. 25, 2022
Jun. 30, 2021
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-55605    
Entity Registrant Name Griffin Realty Trust, Inc.    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 46-4654479    
Entity Address, Address Line One 1520 E. Grand Ave    
Entity Address, City or Town El Segundo    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90245    
City Area Code 310    
Local Phone Number 606-3200    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 0
Documents Incorporated by Reference
Documents Incorporated by Reference:
The Registrant incorporates by reference in Part III (Items 10, 11, 12, 13 and 14) of this Form 10-K portions of its Definitive Proxy Statement for the 2022 Annual Meeting of Stockholders.
    
Entity Central Index Key 0001600626    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Class T      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   565,265  
Class S      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,801  
Class D      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   42,013  
Class I      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,911,819  
Class A      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   24,509,573  
Class AA      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   47,592,118  
Class AAA      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   926,936  
Class E      
Entity Information [Line Items]      
Entity Common Stock, Shares Outstanding   249,088,662