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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2015
Segment Reporting [Abstract]  
Schedule of total revenue by business segments
Aon's total revenue is as follows (in millions):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015

2014
 
2015
 
2014
Risk Solutions
$
1,689

 
$
1,836

 
$
5,417

 
$
5,778

HR Solutions
1,064

 
1,057

 
3,013

 
3,004

Intersegment eliminations
(11
)
 
(13
)
 
(36
)
 
(36
)
Total revenue
$
2,742

 
$
2,880

 
$
8,394

 
$
8,746
Schedule of commissions, fees and other revenues by products
Commissions, fees and other revenues by product are as follows (in millions):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
Retail brokerage
$
1,352

 
$
1,458

 
$
4,363

 
$
4,619

Reinsurance brokerage
331

 
371

 
1,038

 
1,140

Total Risk Solutions Segment
1,683

 
1,829

 
5,401

 
5,759

Consulting services
460

 
466

 
1,222

 
1,245

Outsourcing
616

 
604

 
1,819

 
1,788

Intrasegment
(12
)
 
(13
)
 
(28
)
 
(29
)
Total HR Solutions Segment
1,064

 
1,057

 
3,013

 
3,004

Intersegment
(11
)
 
(13
)
 
(36
)
 
(36
)
Total commissions, fees and other revenue
$
2,736

 
$
2,873

 
$
8,378

 
$
8,727
Schedule of fiduciary investment income by business segments
Fiduciary investment income by segment is as follows (in millions):
 
Three months ended September 30,
 
Nine months ended September 30,
 
2015
 
2014
 
2015
 
2014
Risk Solutions
$
6

 
$
7

 
$
16

 
$
19

HR Solutions
—

 
—

 
—

 
—

Total fiduciary investment income
$
6

 
$
7

 
$
16

 
$
19
Schedule of reconciliation of segment income before tax to income from continuing operations before income taxes
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,
 
2015
 
2014
 
2015
 
2014
Risk Solutions
$
324

 
$
343

 
$
1,015

 
$
1,205

HR Solutions
134

 
113

 
249

 
249

Segment income before income taxes
458

 
456

 
1,264

 
1,454

Unallocated expenses
(45
)
 
(39
)
 
(133
)
 
(123
)
Interest income
3

 
3

 
10

 
7

Interest expense
(72
)
 
(65
)
 
(205
)
 
(188
)
Other income
8

 
35

 
51

 
34

Income before income taxes
$
352

 
$
390

 
$
987

 
$
1,184