New Accounting Pronouncements (Policies)	3 Months Ended
New Accounting Pronouncements (Policies)	Mar. 31, 2025
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Readers of this Quarterly Report on Form 10-Q (Quarterly Report) should refer to the audited financial statements and notes to consolidated financial statements of CBRE Group, Inc., a Delaware corporation (which may be referred to in these financial statements as “CBRE,” “the company,” “we,” “us” and “our”), for the year ended December 31, 2024, which are included in our 2024 Annual Report on Form 10-K (2024 Annual Report), filed with the United States Securities and Exchange Commission (SEC) and also available on our website (www.cbre.com), since we have omitted from this Quarterly Report certain footnote disclosures which would substantially duplicate those contained in such audited financial statements. You should also refer to Note 2 – Significant Accounting Policies, in the notes to consolidated financial statements in our 202 4 Annual Report for further discussion of our significant accounting policies and estimates. Financial Statement Preparation The accompanying consolidated financial statements have been prepared in accordance with the rules applicable to quarterly reports on Form 10-Q and include all information and footnotes required for interim financial statement presentation, but do not include all disclosures required under accounting principles generally accepted in the United States (U.S.), or General Accepted Accounting Principles (GAAP), for annual financial statements.
Use of Estimates	Our consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the U.S., which require management to make estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts reported in our consolidated financial statements and accompanying notes and are based on our best judgment. We evaluate our estimates and assumptions on an ongoing basis using historical experience and other factors, including consideration of the current economic environment, and adjust such estimates and assumptions when facts and circumstances dictate.
Recent Accounting Pronouncements Pending Adoption	Recent Accounting Pronouncements Pending Adoption In December 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2023-09, “Improvements to Income Tax Disclosures.” This ASU requires disaggregated information about a reporting entity’s effective tax rate reconciliation as well as information on income taxes paid and will be effective for annual periods beginning after December 15, 2024. The new requirements should be applied on a prospective basis with an option to apply them retrospectively. Early adoption is permitted. We are evaluating the impact that ASU 2023-09 will have on our consolidated financial statements and related disclosures. In November 2024, the FASB issued ASU 2024-03, “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” This ASU requires public business entities to disclose additional information about specific expense categories in the notes to financial statements at interim and annual reporting periods. This guidance is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027 with early adoption permitted. These requirements should be applied on a prospective basis with an option to apply them retrospectively. We are evaluating the impact that ASU 2024-03 will have on our consolidated financial statement disclosures.