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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Selected Information And Details For MMC's Operating Segments
Selected information about the Company’s operating segments for the three and nine month periods ended September 30, 2016 and 2015 are as follows:
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions)
Revenue
 
Operating
Income
(Loss)
 
Revenue
 
Operating
Income
(Loss)
2016–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,632

(a) 
$
315

 
$
5,350

(c) 
$
1,340

Consulting
1,513

(b) 
308

 
4,530

(d) 
838

Total Operating Segments
3,145

  
623

 
9,880

  
2,178

Corporate / Eliminations
(10
)
 
(51
)
 
(33
)
 
(147
)
Total Consolidated
$
3,135

  
$
572

 
$
9,847

  
$
2,031

2015–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,584

(a) 
$
225

 
$
5,137

(c) 
$
1,185

Consulting
1,540

(b) 
285

 
4,448

(d) 
781

Total Operating Segments
3,124

  
510

 
9,585

  
1,966

Corporate / Eliminations
(9
)
 
(49
)
 
(30
)
 
(141
)
Total Consolidated
$
3,115

  
$
461

 
$
9,555

  
$
1,825


(a) 
Includes inter-segment revenue of $1 million and $0 million in 2016 and 2015, respectively, interest income on fiduciary funds of $8 million and $6 million in 2016 and 2015, respectively, and equity method income of $4 million in 2016 and $2 million in 2015, respectively.
(b) 
Includes inter-segment revenue of $9 million in both 2016 and 2015, interest income on fiduciary funds of $1 million in both 2016 and 2015, and equity method income of $5 million in both 2016 and 2015.
(c) 
Includes inter-segment revenue of $5 million in both 2016 and in 2015, interest income on fiduciary funds of $20 million and $16 million in 2016 and 2015, respectively, and equity method income of $11 million and $4 million in 2016 and 2015, respectively.
(d) 
Includes inter-segment revenue of $28 million and $25 million in 2016 and 2015, respectively, interest income on fiduciary funds of $2 million and $3 million in 2016 and 2015, respectively, and equity method income of $14 million and $13 million in 2016 and 2015, respectively.
Details of Operating Segment Revenue
Details of operating segment revenue for the three and nine month periods ended September 30, 2016 and 2015 are as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions)
2016

 
2015

 
2016

 
2015

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
1,370

 
$
1,322

 
$
4,427

 
$
4,230

Guy Carpenter
262

 
262

 
923

 
907

Total Risk and Insurance Services
1,632

 
1,584

 
5,350

 
5,137

Consulting
 
 
 
 
 
 
 
Mercer
1,109

 
1,090

 
3,227

 
3,173

Oliver Wyman Group
404

 
450

 
1,303

 
1,275

Total Consulting
1,513

 
1,540

 
4,530

 
4,448

Total Operating Segments
3,145

 
3,124

 
9,880

 
9,585

Corporate / Eliminations
(10
)
 
(9
)
 
(33
)
 
(30
)
Total
$
3,135

 
$
3,115

 
$
9,847

 
$
9,555