Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

	Years Ended December 31
	2021		2020		2019
Commercial Risk Solutions	$	6,635	$	5,861	$	5,857
Reinsurance Solutions	1,997		1,814		1,686
Health Solutions	2,154		2,067		2,104
Wealth Solutions	1,426		1,341		1,380
Elimination	(19)		(17)		(14)
Total revenue	$	12,193	$	11,066	$	11,013

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
	2021		2020		2019
U.S.	$	5,459	$	5,032	$	5,016
Americas other than U.S.	1,027		911		919
U.K.	1,681		1,579		1,502
Ireland	127		84		75
Europe, Middle East, & Africa other than U.K. and Ireland	2,565		2,236		2,263
Asia Pacific	1,334		1,224		1,238
Total revenue	$	12,193	$	11,066	$	11,013

Capitalized Contract Cost

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

	2021		2020
Balance at beginning of period	$	339	$	335
Additions	1,504		1,360
Amortization	(1,478)		(1,360)
Impairment	—		—
Foreign currency translation and other	(4)		4
Balance at end of period	$	361	$	339

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

	2021		2020
Balance at beginning of period	$	184	$	171
Additions	59		61
Amortization	(48)		(47)
Impairment	—		—
Foreign currency translation and other	(16)		(1)
Balance at end of period	$	179	$	184