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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2013
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,
 
2013

2012
 
2013
 
2012
Risk Solutions
$
1,821


$
1,778

 
$
5,736

 
$
5,582

HR Solutions
981


971

 
2,891

 
2,847

Intersegment elimination
(8
)

(12
)
 
(21
)
 
(30
)
Total revenue
$
2,794


$
2,737

 
$
8,606

 
$
8,399
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,
 
2013
 
2012
 
2013
 
2012
Retail brokerage
$
1,424

 
$
1,390

 
$
4,548

 
$
4,395

Reinsurance brokerage
389

 
377

 
1,167

 
1,156

Total Risk Solutions Segment
1,813

 
1,767

 
5,715

 
5,551

Consulting services
406

 
394

 
1,176

 
1,140

Outsourcing
587

 
585

 
1,746

 
1,723

Intrasegment
(12
)
 
(8
)
 
(31
)
 
(16
)
Total HR Solutions Segment
981

 
971

 
2,891

 
2,847

Intersegment
(8
)
 
(12
)
 
(21
)
 
(30
)
Total commissions, fees and other revenue
$
2,786

 
$
2,726

 
$
8,585

 
$
8,368
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,
 
2013
 
2012
 
2013
 
2012
Risk Solutions
$
8

 
$
11

 
$
21

 
$
31

HR Solutions
—

 
—

 
—

 
—

Total fiduciary investment income
$
8

 
$
11

 
$
21

 
$
31
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,
 
2013
 
2012
 
2013
 
2012
Risk Solutions
$
333

 
$
309

 
$
1,127

 
$
1,059

HR Solutions
75

 
80

 
162

 
211

Segment income before income taxes
408

 
389

 
1,289

 
1,270

Unallocated expenses
(44
)
 
(50
)
 
(133
)
 
(135
)
Interest income
3

 
1

 
6

 
6

Interest expense
(53
)
 
(57
)
 
(153
)
 
(173
)
Other income (expense)
39

 
(9
)
 
54

 
3

Income before income taxes
$
353

 
$
274

 
$
1,063

 
$
971