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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016 are as follows:
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions)
Revenue
 
Operating
Income
(Loss)
 
Revenue
 
Operating
Income
(Loss)
2017–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,763

(a) 
$
314

 
$
5,668

(c) 
$
1,455

Consulting
1,587

(b) 
329

 
4,705

(d) 
853

Total Operating Segments
3,350

  
643

 
10,373

  
2,308

Corporate / Eliminations
(9
)
 
(46
)
 
(34
)
 
(138
)
Total Consolidated
$
3,341

  
$
597

 
$
10,339

  
$
2,170

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


(a) 
Includes inter-segment revenue of $1 million in both 2017 and 2016, interest income on fiduciary funds of $11 million and $8 million in 2017 and 2016, respectively, and equity method income of $2 million and $4 million in 2017 and 2016, respectively.
(b) 
Includes inter-segment revenue of $8 million and $9 million in 2017 and 2016, respectively, interest income on fiduciary funds of $2 million in 2017 and $1 million in 2016, respectively, and equity method income of $3 million in 2017 and $5 million in 2016, respectively.
(c) 
Includes inter-segment revenue of $5 million in both 2017 and 2016, interest income on fiduciary funds of $28 million and $20 million in 2017 and 2016, respectively, and equity method income of $11 million in both 2017 and 2016.
(d) 
Includes inter-segment revenue of $29 million and $28 million in 2017 and 2016, respectively, interest income on fiduciary funds of $3 million in 2017 and $2 million in 2016, respectively, and equity method income of $12 million in 2017 and $14 million in 2016, respectively.
Details of Operating Segment Revenue
Details of operating segment revenue for the three and nine-month period ended September 30, 2017 and 2016 are as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions)
2017

 
2016

 
2017

 
2016

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
1,490

 
$
1,370

 
$
4,713

 
$
4,427

Guy Carpenter
273

 
262

 
955

 
923

Total Risk and Insurance Services
1,763

 
1,632

 
5,668

 
5,350

Consulting
 
 
 
 
 
 
 
Mercer
1,149

 
1,109

 
3,335

 
3,227

Oliver Wyman Group
438

 
404

 
1,370

 
1,303

Total Consulting
1,587

 
1,513

 
4,705

 
4,530

Total Operating Segments
3,350

 
3,145

 
10,373

 
9,880

Corporate / Eliminations
(9
)
 
(10
)
 
(34
)
 
(33
)
Total
$
3,341

 
$
3,135

 
$
10,339

 
$
9,847