Revenue (Tables)

9 Months Ended

Sep. 30, 2025

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)	2025		2024		2025		2024
Marsh:
EMEA	$	813	$	747	$	2,878	$	2,684
Asia Pacific	361		342		1,105		1,069
Latin America	137		134		393		396
Total International	1,311		1,223		4,376		4,149
U.S./Canada	2,089		1,711		6,326		5,053
Total Marsh	3,400		2,934		10,702		9,202
Guy Carpenter	398		381		2,281		2,161
Subtotal	3,798		3,315		12,983		11,363
Fiduciary interest income	109		138		311		385
Total Risk and Insurance Services	$	3,907	$	3,453	$	13,294	$	11,748
Mercer:
Wealth	$	705	$	625	$	2,060	$	1,909
Health	555		520		1,757		1,605
Career	319		307		756		742
Total Mercer	1,579		1,452		4,573		4,256
Oliver Wyman Group	886		810		2,577		2,436
Total Consulting	$	2,465	$	2,262	$	7,150	$	6,692

Schedule of Contract Assets and Liabilities

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

(In millions)	September 30, 2025		December 31, 2024
Contract assets	$	557	$	473
Contract liabilities	$	919	$	866