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Segment Information
 9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Segment Information Segment Information
The Company is organized based on the types of services provided. Under this structure, the Company’s segments are:
•Risk and Insurance Services, comprising insurance services (Marsh) and reinsurance services (Guy Carpenter); and
•Consulting, comprising Mercer and Oliver Wyman Group.
The accounting policies of the segments are the same as those used for the consolidated financial statements described in Note 1 to the Company’s 2019 Form 10-K. Segment performance is evaluated based on segment operating income, which includes directly related expenses, and charges or credits related to integration and restructuring but not the Company’s corporate-level expenses. Revenues are attributed to geographic areas on the basis of where the services are performed.
Prior to being acquired by the Company, JLT operated in three segments: Specialty, Reinsurance and Employee Benefits. JLT operated in 41 countries, with significant revenue in the United Kingdom, Pacific, Asia and the United States. As of April 1, 2019, the historical JLT businesses were combined into MMC operations as follows: JLT Specialty is included by geography within Marsh, JLT Reinsurance is included in Guy Carpenter and the majority of JLT's Employee Benefits business was included in Mercer Health and Wealth.
Selected information about the Company’s operating segments for the three and nine-month periods ended September 30, 2020 and 2019 are as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)Revenue Operating Income
(Loss)		Revenue Operating Income
(Loss)
2020–
Risk and Insurance Services$2,291 
(a)
$333 $7,805 
(c) 
$1,883 
Consulting1,696 
(b)
278 5,074 
(d) 
815 
Total Operating Segments3,987 611 12,879 2,698 
Corporate/Eliminations(19)(71)(71)(203)
Total Consolidated$3,968 $540 $12,808 $2,495 
2019–
Risk and Insurance Services$2,206 
(a)
$218 $7,203 
(c) 
$1,468 
Consulting1,785 
(b)
317 5,258 
(d) 
874 
Total Operating Segments3,991 535 12,461 2,342 
Corporate/Eliminations(23)(68)(73)(257)
Total Consolidated$3,968 $467 $12,388 $2,085 
(a) Includes inter-segment revenue of $3 million in 2019, interest income on fiduciary funds of $8 million and $31 million in 2020 and 2019, respectively, and equity method loss of $6 million in 2020 and equity method income of $10 million in 2019.
(b) Includes inter-segment revenue of $19 million and $20 million in 2020 and 2019, respectively, interest income on fiduciary funds of less than $1 million in both 2020 and 2019.
(c) Includes inter-segment revenue of $5 million and $7 million in 2020 and 2019, respectively, interest income on fiduciary funds of $40 million and $80 million in 2020 and 2019, respectively, and equity method income of $7 million and $16 million in 2020 and 2019, respectively.
(d) Includes inter-segment revenue of $66 million in both 2020 and 2019, interest income on fiduciary funds of $1 million and $2 million in 2020 and 2019, respectively, and equity method income of $4 million and $10 million in 2020 and 2019, respectively.
Details of operating segment revenue for the three and nine-month periods ended September 30, 2020 and 2019 are as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2020201920202019
Risk and Insurance Services
Marsh$2,015 $1,923 $6,259 $5,850 
Guy Carpenter276 283 1,546 1,353 
Total Risk and Insurance Services2,291 2,206 7,805 7,203 
Consulting    
Mercer1,216 1,280 3,616 3,695 
Oliver Wyman Group480 505 1,458 1,563 
Total Consulting1,696 1,785 5,074 5,258 
Total Operating Segments3,987 3,991 12,879 12,461 
Corporate/Eliminations
(19)(23)(71)(73)
Total$3,968 $3,968 $12,808 $12,388