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Income Per Share Information - Calculation of Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Basic Income Per Share      
Net income attributable to CBRE Group, Inc. stockholders $ 986 $ 1,407 $ 1,837
Weighted average shares outstanding for basic income per share (in shares) 308,430,080 322,813,345 335,232,840
Basic income per share attributable to CBRE Group, Inc. shareholders (in USD per share) $ 3.20 $ 4.36 $ 5.48
Diluted Income Per Share      
Net income attributable to CBRE Group, Inc. stockholders $ 986 $ 1,407 $ 1,837
Weighted average shares outstanding for basic income per share (in shares) 308,430,080 322,813,345 335,232,840
Dilutive effect of contingently issuable shares (in shares) 4,120,862 4,882,770 4,484,561
Weighted average shares outstanding for diluted income per share (in shares) 312,550,942 327,696,115 339,717,401
Diluted income per share attributable to CBRE Group, Inc. shareholders (in USD per share) $ 3.15 $ 4.29 $ 5.41