Basis of Presentation	6 Months Ended
Basis of Presentation	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [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 “the company,” “we,” “us” and “our”), for the year ended December 31, 2020, which are included in our 2020 Annual Report on Form 10-K (2020 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 2020 Annual Report for further discussion of our significant accounting policies and estimates. Considerations Related to the Covid-19 Pandemic The Covid-19 pandemic has primarily impacted the property sales and leasing lines of business in the Advisory Services segment. Many property owners and occupiers put transactions on hold and withdrew existing mandates, sharply reducing sales and leasing volumes. The effects of Covid-19 have eased in parts of the world where progress has been made with vaccine distribution and global economic conditions have improved. Nevertheless Covid-19 continues to pose public health challenges that impact our operations, particularly as new strains emerge and spread and vaccine administration is slow in parts of the world. As of the date of this Quarterly Report, the majority of workers remain out of their offices and occupier confidence in making long-term office leasing decisions has not returned to pre-pandemic levels. See Note 5 (Fair Value Measurements) and Note 10 (Commitments and Contingencies) for further discussion of Covid-19 considerations. 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 GAAP, for annual financial statements. In our opinion, all adjustments (consisting of normal recurring adjustments, except as otherwise noted) considered necessary for a fair presentation have been included. The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions about future events, including the impact Covid-19 may have on our business. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported and reported amounts of revenue and expenses. Such estimates include the value of goodwill, intangibles and other long-lived assets, real estate assets, accounts receivable, contract assets, operating lease assets, investments in unconsolidated subsidiaries and assumptions used in the calculation of income taxes, retirement and other post-employment benefits, among others. These estimates and assumptions 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. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in these estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods. Certain reclassifications have been made to the 2020 financial statements to conform with the 2021 presentation.