Revenue from Contracts with Customers

6 Months Ended

Jun. 30, 2021

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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Commercial Risk Solutions	$	1,349	$	1,126	$	2,638	$	2,272
Reinsurance Solutions	500		448		1,422		1,296
Retirement Solutions	440		393		874		790
Health Solutions	307		258		843		760
Data & Analytic Services	294		274		645		605
Elimination	(4)		(2)		(11)		(7)
Total revenue	$	2,886	$	2,497	$	6,411	$	5,716

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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
United States	$	1,263	$	1,107	$	2,571	$	2,334
Americas other than United States	268		219		518		447
United Kingdom	498		444		1,028		944
Ireland	39		21		72		44
Europe, Middle East, & Africa other than United Kingdom and Ireland	499		404		1,590		1,359
Asia Pacific	319		302		632		588
Total revenue	$	2,886	$	2,497	$	6,411	$	5,716

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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Balance at beginning of period	$	241	$	229	$	339	$	335
Additions	336		274		682		592
Amortization	(357)		(313)		(800)		(729)
Impairment	—		—		—		—
Foreign currency translation and other	2		3		1		(5)
Balance at end of period	$	222	$	193	$	222	$	193

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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
Balance at beginning of period	$	185	$	167	$	184	$	171
Additions	15		16		28		28
Amortization	(13)		(11)		(25)		(23)
Impairment	—		—		—		—
Foreign currency translation and other	(12)		—		(12)		(4)
Balance at end of period	$	175	$	172	$	175	$	172