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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, 2025
Mar. 31, 2024
Basic Income Per Share    
Net income attributable to CBRE Group, Inc. $ 163 $ 126
Weighted average shares outstanding for basic income per share (in shares) 300,288,602 305,808,212
Basic income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 0.54 $ 0.41
Diluted Income Per Share    
Net income attributable to CBRE Group, Inc. $ 163 $ 126
Weighted average shares outstanding for basic income per share (in shares) 300,288,602 305,808,212
Dilutive effect of contingently issuable shares (in shares) 2,626,069 2,694,244
Weighted average shares outstanding for diluted income per share (in shares) 302,914,671 308,502,456
Diluted income per share attributable to CBRE Group, Inc. stockholders (in dollars per share) $ 0.54 $ 0.41