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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
Segment Reporting [Abstract]  
Schedule of reconciliation of segment income before tax to income from continuing operations before income taxes
Revenue from continuing operations for each of the Company’s principal product and service lines is as follows (in millions):
 
Three months ended September 30
 
Nine months ended September 30
 
2017
 
2016
 
2017
 
2016
Commercial Risk Solutions
$
917

 
$
884

 
$
2,943

 
$
2,835

Reinsurance Solutions
355

 
329

 
1,070

 
1,032

Retirement Solutions
491

 
466

 
1,266

 
1,266

Health Solutions
293

 
265

 
977

 
838

Data & Analytic Services
289

 
260

 
842

 
794

Elimination
(5
)
 
(3
)
 
(9
)
 
(6
)
Total revenue
$
2,340

 
$
2,201

 
$
7,089

 
$
6,759