Segment Information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Selected Information And Details For MMC's Operating Segments

Selected information about the Company’s operating segments for the three-month periods ended March 31, 2019 and 2018 are as follows:

	Three Months Ended March 31,
(In millions)	Revenue				Operating Income (Loss)
2019–
Risk and Insurance Services	$	2,423		(a)	$	733
Consulting	1,673			(b)	279
Total Operating Segments	4,096				1,012
Corporate/Eliminations	(25		)		(74		)
Total Consolidated	$	4,071			$	938
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

^(a) Includes inter-segment revenue of $1 million in 2019 and 2018, respectively, interest income on fiduciary funds of $23 million and $13 million in 2019 and 2018, respectively, and equity method income (loss) of $2 million and $(1) million in 2019 and 2018, respectively.

^(b) Includes inter-segment revenue of $24 million and $11 million in 2019 and 2018, respectively, interest income on fiduciary funds of $1 million in 2019 and 2018, respectively, and equity method income of $5 million and $3 million in 2019 and in 2018, respectively.

Details of Operating Segment Revenue

Details of operating segment revenue for the three-month periods ended March 31, 2019 and 2018 are as follows:

	Three Months Ended March 31,
(In millions)	2019			2018
Risk and Insurance Services
Marsh	$	1,753		$	1,703
Guy Carpenter	670			641
Total Risk and Insurance Services	2,423			2,344
Consulting
Mercer	1,155			1,171
Oliver Wyman Group	518			497
Total Consulting	1,673			1,668
Total Operating Segments	4,096			4,012
Corporate/Eliminations	(25		)	(12		)
Total	$	4,071		$	4,000