Segment Information

Beginning in the first quarter of 2017 and following the transaction described in Note 4 “Discontinued Operations,” the Company began leading a set of initiatives designed to strengthen Aon and unite the firm with one portfolio of capability enabled by proprietary data and analytics and one operating model to deliver additional insight, connectivity and efficiency. These initiatives reinforce Aon’s return on invested capital (“ROIC”) decision-making process and emphasis on free cash flow. The Company is now operating as one segment that includes all of Aon’s continuing operations, which as a global professional services firm provides advice and solutions to clients focused on risk, retirement, and health through five revenue lines which make up its principal products and services. The CODM assesses the performance of the Company and allocates resources based on one company: Aon United.

The Company’s reportable operating segment has been determined using a management approach, which is consistent with the basis and manner in which Aon’s CODM uses financial information for the purposes of allocating resources and evaluating performance. The CODM assesses performance and allocates resources based on total Aon results against its key four metrics, including organic revenue growth, expense discipline, and collaborative behaviors that maximize value for Aon and its shareholders, regardless of which revenue line it benefits.

Prior period comparative segment information has been restated to conform with current year presentation. In prior periods, the Company did not include unallocated expenses in segment operating income, which represented corporate governance costs not allocated to the previous operating segments. These costs are now reflected within operating expenses for the current and prior period.

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

As Aon is operating as one segment, segment profit or loss is consistent with consolidated reporting as disclosed on the Consolidated Statements of Income.

Revenues are generally attributed to geographic areas based on the location of the resources producing the revenues. Intercompany revenues and expenses are eliminated in consolidated results. 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

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