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Segment Information
 9 Months Ended
Sep. 30, 2022
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 the Oliver Wyman Group.
The accounting policies of the segments are the same as those utilized for the consolidated financial statements described in Note 1, Summary of Significant Accounting Policies, in the Company’s 2021 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.
Selected information about the Company’s segments for the three and nine months ended September 30, 2022 and 2021 is as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)Revenue Operating Income (Loss)Revenue Operating Income (Loss)
2022–
Risk and Insurance Services$2,838 
(a)
$529 $9,700 
(c) 
$2,617 
Consulting1,951 
(b)
350 6,045 
(d) 
1,217 
Total Operating Segments4,789 879 15,745 3,834 
Corporate/Eliminations(19)(88)(47)(234)
Total Consolidated$4,770 $791 $15,698 $3,600 
2021–
Risk and Insurance Services$2,670 
(a)
$403 $9,036 
(c) 
$2,413 
Consulting1,925 
(b)
404 5,690 
(d) 
1,109 
Total Operating Segments4,595 807 14,726 3,522 
Corporate/Eliminations(12)(67)(43)(196)
Total Consolidated$4,583 $740 $14,683 $3,326 
(a) Includes interest income on fiduciary funds of $40 million and $4 million in 2022 and 2021, respectively, and equity method income of $8 million in 2021.
(b) Includes inter-segment revenue of $19 million and $11 million in 2022 and 2021, respectively.
(c) Includes inter-segment revenue of $5 million in both 2022 and 2021, interest income on fiduciary funds of $57 million and $12 million in 2022 and 2021, respectively, and equity method income of $9 million and $25 million in 2022 and 2021, respectively. Revenue for 2022 also includes the loss on deconsolidation of the Russian businesses of $27 million. Revenue for 2021 includes $52 million primarily from the gain on the sale of the U.K. commercial networks business.
(d) Includes inter-segment revenue of $42 million and $38 million in 2022 and 2021, respectively. Revenue for 2022 also includes a gain on the sale of the Mercer U.S. affinity business of $112 million, partly offset by the loss on deconsolidation of the Russian businesses of $12 million.
Details of operating segment revenue for the three and nine months ended September 30, 2022 and 2021 are as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2022202120222021
Risk and Insurance Services
Marsh$2,497 $2,355 $7,833 $7,336 
Guy Carpenter341 315 1,867 1,700 
Total Risk and Insurance Services2,838 2,670 9,700 9,036 
Consulting    
Mercer1,284 1,315 4,016 3,877 
Oliver Wyman Group667 610 2,029 1,813 
Total Consulting1,951 1,925 6,045 5,690 
Total Operating Segments4,789 4,595 15,745 14,726 
Corporate Eliminations(19)(12)(47)(43)
Total$4,770 $4,583 $15,698 $14,683