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Segment Information
 9 Months Ended
Sep. 30, 2021
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 2020 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 operating segments for the three and nine month periods ended September 30, 2021 and 2020 are as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)Revenue Operating Income
(Loss)		Revenue Operating Income
(Loss)
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 
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 
(a) Includes interest income on fiduciary funds of $4 million and $8 million in 2021 and 2020, respectively, and equity method income of $8 million in 2021 and equity method loss of $6 million in 2020.
(b) Includes inter-segment revenue of $11 million and $19 million in 2021 and 2020, respectively.
(c) Includes inter-segment revenue of $5 million for both 2021 and 2020, interest income on fiduciary funds of $12 million and $40 million in 2021 and 2020, respectively, and equity method income of $25 million and $7 million in 2021 and 2020, respectively.
(d) Includes inter-segment revenue of $38 million and $66 million in 2021 and 2020, respectively, and equity method income of $4 million in 2020 and none in 2021.
Details of operating segment revenue for the three and nine month periods ended September 30, 2021 and 2020 are as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2021202020212020
Risk and Insurance Services
Marsh$2,355 $2,015 $7,336 $6,259 
Guy Carpenter315 276 1,700 1,546 
Total Risk and Insurance Services2,670 2,291 9,036 7,805 
Consulting    
Mercer1,315 1,216 3,877 3,616 
Oliver Wyman Group610 480 1,813 1,458 
Total Consulting1,925 1,696 5,690 5,074 
Total Operating Segments4,595 3,987 14,726 12,879 
Corporate/Eliminations(12)(19)(43)(71)
Total$4,583 $3,968 $14,683 $12,808