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

2014
 
2015
 
2014
Risk Solutions
$
1,833

 
$
1,948

 
$
3,728

 
$
3,942

HR Solutions
979

 
982

 
1,949

 
1,947

Intersegment eliminations
(7
)
 
(11
)
 
(25
)
 
(23
)
Total revenue
$
2,805

 
$
2,919

 
$
5,652

 
$
5,866
Schedule of commissions, fees and other revenues by products
Commissions, fees and other revenues by product are as follows (in millions):
 
Three months ended June 30,
 
Six months ended June 30,
 
2015
 
2014
 
2015
 
2014
Retail brokerage
$
1,498

 
$
1,582

 
$
3,011

 
$
3,161

Reinsurance brokerage
330

 
360

 
707

 
769

Total Risk Solutions Segment
1,828

 
1,942

 
3,718

 
3,930

Consulting services
391

 
395

 
762

 
779

Outsourcing
599

 
595

 
1,203

 
1,184

Intrasegment
(11
)
 
(8
)
 
(16
)
 
(16
)
Total HR Solutions Segment
979

 
982

 
1,949

 
1,947

Intersegment
(7
)
 
(11
)
 
(25
)
 
(23
)
Total commissions, fees and other revenue
$
2,800

 
$
2,913

 
$
5,642

 
$
5,854
Schedule of fiduciary investment income by business segments
Fiduciary investment income by segment is as follows (in millions):
 
Three months ended June 30,
 
Six months ended June 30,
 
2015
 
2014
 
2015
 
2014
Risk Solutions
$
5

 
$
6

 
$
10

 
$
12

HR Solutions
—

 
—

 
—

 
—

Total fiduciary investment income
$
5

 
$
6

 
$
10

 
$
12
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 June 30,
 
Six months ended June 30,
 
2015
 
2014
 
2015
 
2014
Risk Solutions
$
279

 
$
417

 
$
691

 
$
862

HR Solutions
39

 
69

 
115

 
136

Segment income before income taxes
318

 
486

 
806

 
998

Unallocated expenses
(41
)
 
(41
)
 
(88
)
 
(84
)
Interest income
4

 
2

 
7

 
4

Interest expense
(68
)
 
(65
)
 
(133
)
 
(123
)
Other income (expense)
1

 
(2
)
 
43

 
(1
)
Income before income taxes
$
214

 
$
380

 
$
635

 
$
794