Revenue from Contracts with Customers

12 Months Ended

Dec. 31, 2023

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):

	Years Ended December 31
	2023		2022		2021
Commercial Risk Solutions	$	7,043	$	6,715	$	6,635
Reinsurance Solutions	2,481		2,190		1,997
Health Solutions	2,433		2,224		2,154
Wealth Solutions	1,431		1,367		1,426
Elimination	(12)		(17)		(19)
Total revenue	$	13,376	$	12,479	$	12,193

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):

	Years Ended December 31
	2023		2022		2021
U.S.	$	5,923	$	5,666	$	5,459
Americas other than U.S.	1,260		1,137		1,027
U.K.	1,819		1,660		1,681
Ireland	113		99		127
Europe, Middle East, & Africa other than U.K. and Ireland	2,672		2,443		2,565
Asia Pacific	1,589		1,474		1,334
Total revenue	$	13,376	$	12,479	$	12,193

Contract Costs

Changes in the net carrying amount of costs to fulfill contracts with customers are as follows (in millions):

	2023		2022
Balance at beginning of period	$	355	$	361
Additions	1,532		1,479
Amortization	(1,522)		(1,480)
Impairment	—		—
Foreign currency translation and other	5		(5)
Balance at end of period	$	370	$	355

Changes in the net carrying amount of costs to obtain contracts with customers are as follows (in millions):

	2023		2022
Balance at beginning of period	$	185	$	179
Additions	57		56
Amortization	(51)		(49)
Impairment	—		—
Foreign currency translation and other	4		(1)
Balance at end of period	$	195	$	185