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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The following table summarizes revenue from contracts with customers by principal service line (in millions):
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Commercial Risk Solutions$1,852 $1,585 $5,675 $5,137 
Reinsurance Solutions503 465 2,305 2,149 
Health Solutions870 552 2,265 1,670 
Wealth Solutions499 352 1,332 1,054 
Eliminations(3)(1)(26)(9)
Total revenue$3,721 $2,953 $11,551 $10,001 
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 September 30,Nine Months Ended September 30,
2024202320242023
United States$2,083 $1,400 $5,432 $4,322 
Americas other than United States263 281 948 890 
United Kingdom437 396 1,568 1,456 
Ireland38 24 106 82 
Europe, Middle East, & Africa other than United Kingdom and Ireland492 479 2,267 2,093 
Asia Pacific408 373 1,230 1,158 
Total revenue$3,721 $2,953 $11,551 $10,001 
Schedule of Capitalized Contract Cost
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 September 30,Nine Months Ended September 30,
2024202320242023
Balance at beginning of period$264 $242 $370 $355 
Additions400 357 1,166 1,074 
Amortization(367)(321)(1,235)(1,156)
Impairment— — — — 
Foreign currency translation and other5 (5)1 — 
Balance at end of period$302 $273 $302 $273 
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 September 30,Nine Months Ended September 30,
2024202320242023
Balance at beginning of period$196 $186 $195 $185 
Additions19 14 51 37 
Amortization(13)(13)(40)(38)
Impairment— — — — 
Foreign currency translation and other— (1)(4)2 
Balance at end of period$202 $186 $202 $186