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Nature of Operations | 9 Months Ended
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Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Nature of Operations | Nature of Operations Marsh & McLennan Companies, Inc. and its consolidated subsidiaries (the "Company") is a global professional services firm offering clients advice and solutions in risk, strategy and people. Its businesses include: Marsh, the insurance broker, intermediary and risk advisor; Guy Carpenter, the risk and reinsurance specialist; Mercer, the provider of HR and Investment related financial advice and services; and Oliver Wyman Group, the management, economic and brand consultancy. With 76,000 colleagues worldwide and annual revenue of $17 billion, the Company provides analysis, advice and transactional capabilities to clients in more than 130 countries. Business Update Related To COVID-19 The Coronavirus (COVID-19) pandemic has impacted essentially every geography in which the Company operates. Governments implemented various restrictions around the world, including closure of non-essential businesses, travel, shelter-in-place requirements for citizens and other restrictions. Through the end of the third quarter, the vast majority of the Company’s colleagues have continued working in a remote work environment, with minimal disruption to the Company as a whole and its ability to serve clients. The safety and well-being of our colleagues continues to be our first priority. As many countries have begun to re-open their economies, there are various conditions imposed by each jurisdiction, and new restrictions may be imposed based on local circumstances. The Company has re-opened offices in various locations around the world, while ensuring that it continues to adhere to guidelines and orders issued by national, state and local governments. The timing of office re-openings will vary based on the conditions and restrictions in each location, but it remains uncertain the extent to which colleagues will return to offices for the remainder of the year and into 2021. However, the Company expects it will continue its ability to service clients effectively while colleagues remain in a remote work environment. The ultimate extent of the COVID-19 impact to the Company will depend on numerous evolving factors and future developments that it is not able to predict. Factors that could adversely affect the Company’s financial statements related to the financial and operational impact of COVID-19 are outlined in “Item 1A - Risk Factors” in the Company’s Form 10-Q for the quarter ended March 31, 2020. JLT Acquisition On April 1, 2019, the Company completed its acquisition (the "Transaction") of all of the outstanding shares of Jardine Lloyd Thompson Group plc ("JLT"), a public company organized under the laws of England and Wales. JLT's results of operations for the three and nine month periods ended September 30, 2020 are included in the Company's results of operations. The Company's results for the nine months ended September 30, 2019 do not reflect JLT’s results of operations for the three months ended March 31, 2019 and therefore may affect comparability.

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- Definition The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -URI http://asc.fasb.org/topic&trid=2134479 + Details
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