Revenue (Tables)

9 Months Ended

Sep. 30, 2024

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following table disaggregates various components of the Company's revenue:

	Three Months Ended  September 30,				Nine Months Ended  September 30,
(In millions)	2024		2023		2024		2023
Marsh:
EMEA	$	747	$	692	$	2,684	$	2,482
Asia Pacific	342		311		1,069		980
Latin America	134		134		396		386
Total International	1,223		1,137		4,149		3,848
U.S./Canada	1,711		1,563		5,053		4,634
Total Marsh	2,934		2,700		9,202		8,482
Guy Carpenter	381		359		2,161		2,006
Subtotal	3,315		3,059		11,363		10,488
Fiduciary interest income	138		131		385		330
Total Risk and Insurance Services	$	3,453	$	3,190	$	11,748	$	10,818
Mercer:
Wealth	$	625	$	635	$	1,909	$	1,853
Health	520		496		1,605		1,559
Career	307		294		742		731
Total Mercer	1,452		1,425		4,256		4,143
Oliver Wyman Group	810		781		2,436		2,266
Total Consulting	$	2,262	$	2,206	$	6,692	$	6,409

Schedule of Contract Assets and Liabilities

The following table provides contract assets and contract liabilities information from contracts with customers:

(In millions)	September 30, 2024		December 31, 2023
Contract assets	$	433	$	357
Contract liabilities	$	864	$	869