New Accounting Pronouncements (Policies)	3 Months Ended
New Accounting Pronouncements (Policies)	Mar. 31, 2024
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, 2023, which are included in our 2023 Annual Report on Form 10-K (2023 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 2023 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	Recently Adopted Accounting Pronouncements In June 2022, the Financial Standards Board (FASB) issued Accounting Standards Update (ASU) 2022-03, “Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions.” The amendments in the ASU clarify that a contractual restriction on the sale of an equity security is not considered part of the unit of account of the equity security and, therefore, is not considered in measuring fair value. The ASU introduces new disclosure requirements to provide investors with information about the restriction including the nature and remaining duration of the restriction. This guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. We adopted ASU 2022-03 in the first quarter of 2024. The adoption did not have a material impact on the valuation of our equity securities. To the extent we have material equity securities subject to contractual sale restrictions, we have included the required disclosures within the notes to our consolidated financial statements. In March 2023, the FASB issued ASU 2023-01, “Leases (Topic 842): Common Control Arrangements.” This update requires that leasehold improvements associated with common control leases be amortized over the useful life of the leasehold improvements to the common control group (regardless of the lease term) and accounted for as a transfer between entities under common control through an adjustment to equity if, and when, the lessee no longer controls the use of the underlying asset. This guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. We adopted ASU 2023-01 in the first quarter of 2024 and the adoption did not have a material impact on our consolidated financial statements and related disclosures. In March 2023, the FASB issued ASU 2023-02, “Investments – Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization method.” This update permits an accounting election to account for tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. This guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within those fiscal years. We adopted ASU 2023-02 in the first quarter of 2024 and the adoption did not have a material impact on our consolidated financial statements and related disclosures. Recent Accounting Pronouncements Pending Adoption In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” This update enhances reportable segment disclosures by requiring a public entity to: 1) disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker (CODM) and included within each reported measure of segment profit or loss, 2) disclose, on an annual and interim basis, an amount of other segment items by reportable segment and a description of its composition, 3) provide all annual disclosures about a reportable segment’s profit or loss and assets currently required by Topic 280 in interim periods, 4) disclose the title and position of the CODM and an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources, and 5) provide all the disclosures required by this update and all existing segment disclosures in Topic 280 if the entity has a single reportable segment. This ASU also clarifies that, in addition to the measure that is most consistent with the measurement principles under GAAP, a public entity is not precluded from reporting additional measures of a segment’s profit or loss that are used by the CODM in assessing segment performance and deciding how to allocate resources. This guidance is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. We are evaluating the impact this guidance will have on our consolidated financial statements and related disclosures. In December 2023, the FASB issued 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.