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Income Per Share and Stockholders' Equity - Schedule of Calculations of Basic and Diluted Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Basic Income Per Share    
Net income attributable to CBRE Group, Inc. stockholders $ 126 $ 117
Weighted average shares outstanding for basic income per share (in shares) 305,808,212 310,464,609
Basic income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 0.41 $ 0.38
Diluted Income Per Share    
Net income attributable to CBRE Group, Inc. stockholders $ 126 $ 117
Weighted average shares outstanding for basic income per share (in shares) 305,808,212 310,464,609
Dilutive effect of contingently issuable shares (in shares) 2,694,244 4,893,538
Weighted average shares outstanding for diluted income per share (in shares) 308,502,456 315,358,147
Diluted income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 0.41 $ 0.37