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Segment Information
 9 Months Ended
Sep. 30, 2016
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 Condensed 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):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2016

2015
 
2016
 
2015
Risk Solutions
$
1,715

 
$
1,689

 
$
5,434

 
$
5,417

HR Solutions
1,041

 
1,064

 
2,902

 
3,013

Intersegment eliminations
(10
)
 
(11
)
 
(32
)
 
(36
)
Total revenue
$
2,746

 
$
2,742

 
$
8,304

 
$
8,394



Commissions, fees and other revenues by product are as follows (in millions):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2016
 
2015
 
2016
 
2015
Retail brokerage
$
1,377

 
$
1,352

 
$
4,380

 
$
4,363

Reinsurance brokerage
332

 
331

 
1,038

 
1,038

Total Risk Solutions Segment
1,709

 
1,683

 
5,418

 
5,401

Consulting services
459

 
460

 
1,216

 
1,222

Outsourcing
593

 
616

 
1,703

 
1,819

Intrasegment
(11
)
 
(12
)
 
(17
)
 
(28
)
Total HR Solutions Segment
1,041

 
1,064

 
2,902

 
3,013

Intersegment
(10
)
 
(11
)
 
(32
)
 
(36
)
Total commissions, fees and other revenue
$
2,740

 
$
2,736

 
$
8,288

 
$
8,378


 
Fiduciary investment income by segment is as follows (in millions):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2016
 
2015
 
2016
 
2015
Risk Solutions
$
6

 
$
6

 
$
16

 
$
16

HR Solutions
—

 
—

 
—

 
—

Total fiduciary investment income
$
6

 
$
6

 
$
16

 
$
16


 
A reconciliation of segment operating income before tax to income before income taxes is as follows (in millions):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2016
 
2015
 
2016
 
2015
Risk Solutions
$
330

 
$
324

 
$
1,132

 
$
1,015

HR Solutions
134

 
134

 
276

 
249

Segment income before income taxes
464

 
458

 
1,408

 
1,264

Unallocated expenses
(42
)
 
(45
)
 
(131
)
 
(133
)
Interest income
1

 
3

 
6

 
10

Interest expense
(70
)
 
(72
)
 
(212
)
 
(205
)
Other income
9

 
8

 
27

 
51

Income before income taxes
$
362

 
$
352

 
$
1,098

 
$
987


 
Unallocated expenses include administrative or other costs not attributable to the reportable 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 transactions.