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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018 and 2017 are as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions)
Revenue
 
Operating
Income
(Loss)
 
Revenue
 
Operating
Income
(Loss)
2018–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,863

(a) 
$
293

 
$
6,303

(c) 
$
1,481

Consulting
1,656

(b) 
291

 
4,974

(d) 
805

Total Operating Segments
3,519

  
584

 
11,277

  
2,286

Corporate / Eliminations
(15
)
 
(43
)
 
(39
)
 
(146
)
Total Consolidated
$
3,504

  
$
541

 
$
11,238

  
$
2,140

2017–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,763

(a) 
$
268

 
$
5,668

(c) 
$
1,318

Consulting
1,587

(b) 
311

 
4,705

(d) 
801

Total Operating Segments
3,350

  
579

 
10,373

  
2,119

Corporate / Eliminations
(9
)
 
(44
)
 
(34
)
 
(134
)
Total Consolidated
$
3,341

  
$
535

 
$
10,339

  
$
1,985


(a) Includes inter-segment revenue $4 million and $1 million in 2018 and 2017, respectively, interest income on fiduciary funds of $18 million and $11 million in 2018 and 2017, respectively, and equity method income of $4 million and $2 million in 2018 and 2017, respectively and $51 million related to the sale of business in 2018.
(b) Includes inter-segment revenue of $11 million and $8 million in 2018 and 2017, respectively, interest income on fiduciary funds of $1 million and $2 million in 2018 and 2017, respectively, and equity method income of $4 million and $3 million in 2018 and 2017, respectively.
(c) Includes inter-segment revenue of $5 million in both 2018 and 2017, interest income on fiduciary funds of $46 million and $28 million in 2018 and 2017, respectively, and equity method income of $10 million and $11 million in 2018 and 2017, respectively and $51 million related to the sale of business in 2018.
(d) Includes inter-segment revenue of $34 million and $29 million in 2018 and 2017, respectively, interest income on fiduciary funds of $3 million in both 2018 and 2017, respectively, and equity method income of $12 million in both 2018 and in 2017, respectively.
Details of Operating Segment Revenue
Details of operating segment revenue for the three and nine-month periods ended September 30, 2018 and 2017 are as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions)
2018

 
2017

 
2018

 
2017

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
1,643

 
$
1,490

 
$
5,106

 
$
4,713

Guy Carpenter
220

 
273

 
1,197

 
955

Total Risk and Insurance Services
1,863

 
1,763

 
6,303

 
5,668

Consulting
 
 
 
 
 
 
 
Mercer
1,175

 
1,149

 
3,504

 
3,335

Oliver Wyman Group
481

 
438

 
1,470

 
1,370

Total Consulting
1,656

 
1,587

 
4,974

 
4,705

Total Operating Segments
3,519

 
3,350

 
11,277

 
10,373

Corporate / Eliminations
(15
)
 
(9
)
 
(39
)
 
(34
)
Total
$
3,504

 
$
3,341

 
$
11,238

 
$
10,339