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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2016
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,
 
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
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,
 
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
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,
 
2016
 
2015
 
2016
 
2015
Risk Solutions
$
6

 
$
6

 
$
16

 
$
16

HR Solutions
—

 
—

 
—

 
—

Total fiduciary investment income
$
6

 
$
6

 
$
16

 
$
16
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,
 
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