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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
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

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
Revenue from External Customers by Products and Services
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
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):
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
Schedule of consolidated revenue by geographic area
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
Schedule of consolidated non-current assets by geographic area
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