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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Jun. 28, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Annual Report true    
Document Transition Report false    
Document Fiscal Period Focus FY    
Entity Registrant Name CBRE GROUP, INC.    
Entity Central Index Key 0001138118    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   334,790,842  
Entity Public Float     $ 17.3
Title of 12(b) Security Class A Common Stock, $0.01 par value per share    
Trading Symbol CBRE    
Security Exchange Name NYSE    
Entity File Number 001-32205    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3391143    
Entity Address, Address Line One 400 South Hope Street    
Entity Address, Address Line Two 25th Floor    
Entity Address, City or Town Los Angeles    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90071    
City Area Code 213    
Local Phone Number 613-3333    
Documents Incorporated by Reference

Portions of the proxy statement for the registrant’s 2020 Annual Meeting of Stockholders to be held May 14, 2020 are incorporated by reference in Part III of this Annual Report on Form 10-K.