Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Selected Information And Details For MMC's Operating Segments

Selected information about the Company’s operating segments for the three-month period ended March 31, 2018 and 2017 are as follows:

	Three Months Ended March 31,
(In millions)	Revenue				Operating Income (Loss)
2018–
Risk and Insurance Services	$	2,344		(a)	$	716
Consulting	1,668			(b)	247
Total Operating Segments	4,012				963
Corporate / Eliminations	(12		)		(55		)
Total Consolidated	$	4,000			$	908
2017–
Risk and Insurance Services	$	1,989		(a)	$	568
Consulting	1,526			(b)	225
Total Operating Segments	3,515				793
Corporate / Eliminations	(12		)		(44		)
Total Consolidated	$	3,503			$	749

^(a) Includes inter-segment revenue of $1 million in 2018, interest income on fiduciary funds of $13 million and $8 million in 2018 and 2017, respectively, and equity method (loss) income of $(1) million and $2 million in 2018 and 2017, respectively.

^(b) Includes inter-segment revenue of $11 million and $12 million in 2018 and 2017, respectively, interest income on fiduciary funds of $1 million in both 2018 and in 2017, and equity method income of $3 million in 2018 and $4 million in 2017, respectively.

Details of Operating Segment Revenue

Details of operating segment revenue for the three-month period ended March 31, 2018 and 2017 are as follows:

	Three Months Ended March 31,
(In millions)	2018			2017
Risk and Insurance Services
Marsh	$	1,703		$	1,602
Guy Carpenter	641			387
Total Risk and Insurance Services	2,344			1,989
Consulting
Mercer	1,171			1,077
Oliver Wyman Group	497			449
Total Consulting	1,668			1,526
Total Operating Segments	4,012			3,515
Corporate / Eliminations	(12		)	(12		)
Total	$	4,000		$	3,503