Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Revenue from continuing operations for each of the Company’s principal product and service lines is as follows (in millions):

	Year ended December 31
	2017			2016			2015
Commercial Risk Solutions	$	4,169		$	3,929		$	4,029
Reinsurance Solutions	1,429			1,361			1,358
Retirement Solutions	1,755			1,707			1,916
Health Solutions	1,515			1,370			1,167
Data & Analytic Services	1,140			1,050			1,021
Elimination	(10		)	(8		)	(11		)
Total revenue	$	9,998		$	9,409		$	9,480

Schedule of consolidated revenue by geographic area

Consolidated Revenue by geographic area, which is attributed on the basis of where the services are performed, is as follows (in millions):

Years ended December 31	Total		United States		Americas other than U.S.		United Kingdom		Europe, Middle East, & Africa		Asia Pacific
2017	$	9,998	$	4,425	$	976	$	1,436	$	2,025	$	1,136
2016	9,409		3,981		899		1,354		1,760		1,415
2015	9,480		3,924		1,118		1,419		1,826		1,193

Schedule of consolidated non-current assets by geographic area

Consolidated Non-current assets by geographic area are as follows (in millions):

Years ended December 31	Total		United States		Americas other than U.S.		United Kingdom		Europe, Middle East, & Africa		Asia Pacific
2017	$	564	$	239	$	47	$	68	$	114	$	96
2016	550		243		60		65		85		97