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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Feb. 18, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-32205    
Entity Registrant Name CBRE GROUP, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3391143    
Entity Address, Address Line One 2100 McKinney Avenue    
Entity Address, Address Line Two Suite 1250    
Entity Address, City or Town Dallas    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75201    
City Area Code 214    
Local Phone Number 979-6100    
Title of 12(b) Security Class A Common Stock, $0.01 par value per share    
Trading Symbol “CBRE”    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 14.6
Entity Common Stock, Shares Outstanding   335,597,172  
Documents Incorporated by Reference Portions of the proxy statement for the registrant’s 2021 Annual Meeting of Stockholders to be held May 20, 2021 are incorporated by reference in Part III of this Annual Report on Form 10-K.    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001138118