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Nature of Operations
 9 Months Ended
Sep. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Nature of Operations Nature of Operations
Marsh & McLennan Companies, Inc. (the "Company" or "Marsh McLennan"), a global professional services firm, is organized based on the different services that it offers. Under this structure, the Company’s two business segments are Risk and Insurance Services and Consulting.
The Risk and Insurance Services segment ("RIS") provides risk management solutions, services, advice and insurance broking, reinsurance broking and insurance program management services for businesses, public entities, insurance companies, associations, professional services organizations, and private clients. The Company conducts business in this segment through Marsh and Guy Carpenter. Marsh advises individual and commercial clients of all sizes on insurance broking and innovative risk management solutions. Guy Carpenter develops advanced risk, reinsurance and capital strategies that help clients grow profitably and pursue emerging opportunities.
The Company conducts business in its Consulting segment through Mercer and Oliver Wyman Group. Mercer provides consulting expertise, advice, services and solutions in the areas of health, wealth and career consulting services and products. Oliver Wyman Group provides specialized management and economic and brand consulting services.
Business Update Related To COVID-19
The World Health Organization declared COVID-19 a pandemic in March 2020. The pandemic has impacted businesses globally including virtually every geography in which the Company operates. Governments continue to ease restrictions or fully reopen their economies, as the various vaccines are effective in mitigating the effects of the virus. Our businesses have been resilient throughout the pandemic and demand for our advice and services remains strong as the global economic conditions improve.
Although the vast majority of colleagues continue to work in a remote environment, the Company has provided guidelines on a gradual and phased return to the office depending on the level of virus containment and local health and safety regulations in each geography. The safety and well-being of our colleagues is paramount and the Company expects to continue to service clients effectively in the current remote environment and as colleagues gradually return to the office.
The Company had strong revenue growth through the first nine months of 2021 and benefited from the continued recovery of the global economy. However, uncertainty remains in the economic outlook and the ultimate extent of COVID-19 impact to the Company will depend on future developments that it is unable to predict, including new "waves" of infection from emerging variants of the virus, potential renewed restrictions and mandates by various governments or agencies, and the distribution and uptake of vaccines.