Segment Information

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company has two reportable segments: Risk Solutions and HR Solutions. Unallocated income and expenses, when combined with the operating segments and after the elimination of intersegment revenues and expenses, equal the amounts in the Consolidated Financial Statements.

Reportable operating segments have been determined using a management approach, which is consistent with the basis and manner in which Aon's chief operating decision maker ("CODM") uses financial information for the purposes of allocating resources and evaluating performance. The CODM assesses performance based on operating income and generally accounts for inter-segment revenue as if the revenue were from third parties and at what management believes are current market prices. The Company does not present net assets by segment as this information is not reviewed by the CODM.

Risk Solutions acts as an advisor and insurance and reinsurance broker, helping clients manage their risks, via consultation, as well as negotiation and placement of insurance risk with insurance carriers through Aon's global distribution network.

HR Solutions partners with organizations to solve their most complex benefits, talent and related financial challenges, and improve business performance by designing, implementing, communicating and administering a wide range of human capital, retirement, investment management, health care, compensation and talent management strategies.

Aon's total revenue is as follows (in millions):

Years ended December 31	2015			2014			2013
Risk Solutions	$	7,426		$	7,834		$	7,789
HR Solutions	4,303			4,264			4,057
Intersegment eliminations	(47		)	(53		)	(31		)
Total revenue	$	11,682		$	12,045		$	11,815

Commissions, fees and other revenues by product are as follows (in millions):

Years ended December 31	2015			2014			2013
Retail brokerage	$	6,044		$	6,334		$	6,256
Reinsurance brokerage	1,361			1,474			1,505
Total Risk Solutions Segment	7,405			7,808			7,761
Consulting services	1,686			1,700			1,626
Outsourcing	2,658			2,607			2,469
Intrasegment	(41		)	(43		)	(38		)
Total HR Solutions Segment	4,303			4,264			4,057
Intersegment	(47		)	(53		)	(31		)
Total commissions, fees and other revenue	$	11,661		$	12,019		$	11,787

Fiduciary investment income by segment is as follows (in millions):

Years ended December 31	2015		2014		2013
Risk Solutions	$	21	$	26	$	28
HR Solutions	—		—		—
Total fiduciary investment income	$	21	$	26	$	28

A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):

Years ended December 31	2015			2014			2013
Risk Solutions	$	1,506		$	1,648		$	1,540
HR Solutions	536			485			318
Segment income before income taxes	2,042			2,133			1,858
Unallocated expenses	(194		)	(167		)	(187		)
Interest income	14			10			9
Interest expense	(273		)	(255		)	(210		)
Other income	100			44			68
Income before income taxes	$	1,689		$	1,765		$	1,538

Unallocated expenses include administrative or other costs not attributable to the operating segments, such as corporate governance costs. Interest income represents income earned primarily on operating cash balances and certain income producing securities. Interest expense represents the cost of debt obligations.

Other income consists of equity earnings, realized gains or losses on the sale of investments, gains or losses on the disposal of businesses, gains or losses on derivatives, and gains or losses on foreign currency remeasurement.

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 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
2015	$	11,682	$	6,063	$	1,053	$	1,527	$	1,909	$	1,130
2014	12,045		5,824		1,176		1,623		2,189		1,233
2013	11,815		5,574		1,214		1,544		2,304		1,179

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

As of December 31	Total		United States		Americas other than U.S.		United Kingdom		Europe, Middle East, & Africa		Asia Pacific
2015	$	13,051	$	7,072	$	416	$	2,723	$	2,270	$	570
2014	13,805		7,793		493		2,700		2,179		640