Segment Information (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Selected Information And Details For MMC's Operating Segments

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
Consulting	1,925		(b)	404		5,690		(d)	1,109
Total Operating Segments	4,595			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
Consulting	1,696		(b)	278		5,074		(d)	815
Total Operating Segments	3,987			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

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)	2021		2020		2021		2020
Risk and Insurance Services
Marsh	$	2,355	$	2,015	$	7,336	$	6,259
Guy Carpenter	315		276		1,700		1,546
Total Risk and Insurance Services	2,670		2,291		9,036		7,805
Consulting
Mercer	1,315		1,216		3,877		3,616
Oliver Wyman Group	610		480		1,813		1,458
Total Consulting	1,925		1,696		5,690		5,074
Total Operating Segments	4,595		3,987		14,726		12,879
Corporate/Eliminations	(12)		(19)		(43)		(71)
Total	$	4,583	$	3,968	$	14,683	$	12,808