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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015 and 2014 are as follows:
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions of dollars)
Revenue
 
Operating
Income
(Loss)
 
Revenue
 
Operating
Income
(Loss)
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

2014–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,610

(a) 
$
229

 
$
5,240

(c) 
$
1,170

Consulting
1,541

(b) 
274

 
4,493

(d) 
746

Total Operating Segments
3,151

  
503

 
9,733

  
1,916

Corporate / Eliminations
(10
)
 
(58
)
 
(28
)
 
(151
)
Total Consolidated
$
3,141

  
$
445

 
$
9,705

  
$
1,765


(a) 
Includes inter-segment revenue of $0 million in both 2015 and 2014, interest income on fiduciary funds of $6 million in both 2015 and 2014, and equity method income of $2 million and $4 million in 2015 and 2014, respectively.
(b) 
Includes inter-segment revenue of $9 million in 2015 and $10 million in 2014, interest income on fiduciary funds of $1 million in 2015 and $2 million in 2014, and equity method income of $5 million in 2015 and $0 million in 2014.
(c) 
Includes inter-segment revenue of $5 million and $3 million in 2015 and 2014, respectively, interest income on fiduciary funds of $16 million and $18 million in 2015 and 2014, respectively, and equity method income of $4 million in 2015 and $10 million in 2014.
(d) 
Includes inter-segment revenue of $25 million in both 2015 and 2014, interest income on fiduciary funds of $3 million and $5 million in 2015 and 2014, respectively, and equity method income of $13 million in 2015 and $0 million in 2014.
Details of Operating Segment Revenue
Details of operating segment revenue for the three- and nine-month periods ended September 30, 2015 and 2014 are as follows:
 
Three Months Ended September 30,
 
Nine Months Ended
September 30,
(In millions of dollars)
2015

 
2014

 
2015

 
2014

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
1,322

 
$
1,343

 
$
4,230

 
$
4,295

Guy Carpenter
262

 
267

 
907

 
945

Total Risk and Insurance Services
1,584

 
1,610

 
5,137

 
5,240

Consulting
 
 
 
 
 
 
 
Mercer
1,090

 
1,112

 
3,173

 
3,244

Oliver Wyman Group
450

 
429

 
1,275

 
1,249

Total Consulting
1,540

 
1,541

 
4,448

 
4,493

Total Operating Segments
3,124

 
3,151

 
9,585

 
9,733

Corporate / Eliminations
(9
)
 
(10
)
 
(30
)
 
(28
)
Total
$
3,115

 
$
3,141

 
$
9,555

 
$
9,705