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Segment Information (Tables)
 6 Months Ended
Jun. 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 six-month periods ended June 30, 2018 and 2017 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
Revenue
 
Operating
Income
(Loss)
 
Revenue
 
Operating
Income
(Loss)
2018–
 
 
 
 
 
 
 
Risk and Insurance Services
$
2,096

(a) 
$
472

 
$
4,440

(c) 
$
1,188

Consulting
1,650

(b) 
267

 
3,318

(d) 
514

Total Operating Segments
3,746

  
739

 
7,758

  
1,702

Corporate / Eliminations
(12
)
 
(48
)
 
(24
)
 
(103
)
Total Consolidated
$
3,734

  
$
691

 
$
7,734

  
$
1,599

2017–
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,916

(a) 
$
482

 
$
3,905

(c) 
$
1,050

Consulting
1,592

(b) 
265

 
3,118

(d) 
490

Total Operating Segments
3,508

  
747

 
7,023

  
1,540

Corporate / Eliminations
(13
)
 
(46
)
 
(25
)
 
(90
)
Total Consolidated
$
3,495

  
$
701

 
$
6,998

  
$
1,450


(a) Includes inter-segment revenue of $4 million in 2017, interest income on fiduciary funds of $15 million and $9 million in 2018 and 2017, respectively, and equity method income of $7 million in both 2018 and 2017.
(b) Includes inter-segment revenue of $12 million and $9 million in 2018 and 2017, respectively, interest income on fiduciary funds of $1 million and less than $1 million in 2018 and 2017, respectively, and equity method income of $5 million in both 2018 and in 2017.
(c) Includes inter-segment revenue of $1 million and $4 million in 2018 and 2017, respectively, interest income on fiduciary funds of $28 million and $17 million in 2018 and 2017, respectively, and equity method income of $6 million and $9 million in 2018 and 2017, respectively.
(d) Includes inter-segment revenue of $23 million and $21 million in 2018 and 2017, respectively, interest income on fiduciary funds of $2 million and $1 million in 2018 and 2017, respectively, and equity method income of $8 million in 2018 and $9 million in 2017, respectively.
Details of Operating Segment Revenue
Details of operating segment revenue for the three and six-month periods ended June 30, 2018 and 2017 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
2018

 
2017

 
2018

 
2017

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
1,760

 
$
1,621

 
$
3,463

 
$
3,223

Guy Carpenter
336

 
295

 
977

 
682

Total Risk and Insurance Services
2,096

 
1,916

 
4,440

 
3,905

Consulting
 
 
 
 
 
 
 
Mercer
1,158

 
1,109

 
2,329

 
2,186

Oliver Wyman Group
492

 
483

 
989

 
932

Total Consulting
1,650

 
1,592

 
3,318

 
3,118

Total Operating Segments
3,746

 
3,508

 
7,758

 
7,023

Corporate / Eliminations
(12
)
 
(13
)
 
(24
)
 
(25
)
Total
$
3,734

 
$
3,495

 
$
7,734

 
$
6,998