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Revenue (Tables)
 3 Months Ended
Mar. 31, 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
 March 31,
(In millions)20252024
Marsh:
EMEA$1,059 $1,025 
Asia Pacific 335 336 
Latin America124 125 
Total International1,518 1,486 
U.S./Canada1,935 1,517 
Total Marsh3,453 3,003 
Guy Carpenter1,206 1,148 
 Subtotal4,659 4,151 
Fiduciary interest income103 122 
Total Risk and Insurance Services$4,762 $4,273 
Mercer:
Wealth $670 $672 
Health608 538 
Career218 215 
Total Mercer1,496 1,425 
Oliver Wyman Group818 789 
Total Consulting$2,314 $2,214 
Schedule of Contract Assets and Liabilities
The following table provides contract assets and contract liabilities information from contracts with customers:
(In millions)March 31, 2025December 31, 2024
Contract assets$502 $473 
Contract liabilities$952 $866