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Revenue from Contracts with Customers
 3 Months Ended
Mar. 31, 2022
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,
20222021
Commercial Risk Solutions$1,719 $1,640 
Reinsurance Solutions976 922 
Health Solutions638 615 
Wealth Solutions345 355 
Eliminations(8)(7)
Total revenue$3,670 $3,525 
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,
20222021
United States$1,417 $1,308 
Americas other than United States276 250 
United Kingdom528 530 
Ireland29 33 
Europe, Middle East, & Africa other than United Kingdom and Ireland1,058 1,091 
Asia Pacific362 313 
Total revenue$3,670 $3,525 
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,
20222021
Balance at beginning of period$361 $339 
Additions348 346 
Amortization(457)(443)
Impairment— — 
Foreign currency translation and other2 (1)
Balance at end of period$254 $241 
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,
20222021
Balance at beginning of period$179 $184 
Additions15 13 
Amortization(12)(12)
Impairment— — 
Foreign currency translation and other2 — 
Balance at end of period$184 $185