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Revenue from Contracts with Customers
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers Revenue from Contracts with Customers
Disaggregation of Revenue
The following table summarizes revenue from contracts with customers by principal service line (in millions):
Three Months Ended March 31,
20242023
Commercial Risk Solutions$1,808 $1,778 
Reinsurance Solutions1,167 1,077 
Health Solutions733 671 
Wealth Solutions370 350 
Eliminations(8)(5)
Total revenue$4,070 $3,871 
Consolidated revenue from contracts with customers by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):
Three Months Ended March 31,
20242023
United States$1,512 $1,495 
Americas other than United States323 301 
United Kingdom583 554 
Ireland33 30 
Europe, Middle East, & Africa other than United Kingdom and Ireland1,209 1,102 
Asia Pacific410 389 
Total revenue$4,070 $3,871 
Contract Costs
An analysis of the changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):
Three Months Ended March 31,
20242023
Balance at beginning of period$370 $355 
Additions380 362 
Amortization(478)(462)
Impairment— — 
Foreign currency translation and other(3)2 
Balance at end of period$269 $257 
An analysis of the changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):
Three Months Ended March 31,
20242023
Balance at beginning of period$195 $185 
Additions14 10 
Amortization(13)(12)
Impairment— — 
Foreign currency translation and other(2)— 
Balance at end of period$194 $183