Segment Information (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Schedule of Selected Information And Details For MMC's Operating Segments

Selected information about the Company’s segments for the three months ended March 31, 2024 and 2023 is as follows:

	Three Months Ended  March 31,
(In millions)	Revenue			Operating Income/(Loss)
2024 –
Risk and Insurance Services	$	4,273	(a)	$	1,565
Consulting	2,214		(b)	432
Total Segments	6,487			1,997
Corporate/Eliminations	(14)			(72)
Total Consolidated	$	6,473		$	1,925
2023 –
Risk and Insurance Services	$	3,906	(a)	$	1,395
Consulting	2,031		(b)	411
Total Segments	5,937			1,806
Corporate/Eliminations	(13)			(80)
Total Consolidated	$	5,924		$	1,726

(a)Includes interest income on fiduciary funds of $122 million and $91 million in 2024 and 2023, respectively.

(b)Includes inter-segment revenue of $13 million in 2024 and 2023. Revenue in 2024 also includes a net gain of $21 million from the sale of Mercer's U.K. pension administration and U.S. health and benefits administration businesses.

Schedule of Details of Operating Segment Revenue

Details of operating segment revenue for the three months ended March 31, 2024 and 2023 are as follows:

	Three Months Ended  March 31,
(In millions)	2024		2023
Risk and Insurance Services
Marsh	$	3,081	$	2,800
Guy Carpenter	1,192		1,106
Total Risk and Insurance Services	4,273		3,906
Consulting
Mercer	1,425		1,344
Oliver Wyman Group	789		687
Total Consulting	2,214		2,031
Total Segments	6,487		5,937
Corporate Eliminations	(14)		(13)
Total	$	6,473	$	5,924