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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Selected information and details for MMC's operating segments
Selected information about the Company’s segments and geographic areas of operation are as follows:
For the Year Ended December 31, (In millions of dollars)
Revenue

 
Operating
Income
(Loss)
 
Total
Assets
 
Depreciation
and
Amortization
 
Capital
Expenditures
2017 –
 
 
 
 
 
 
 
 
 
Risk and Insurance Services
$
7,630

(a) 
$
1,731

  
$
16,490

 
$
282

 
$
139

Consulting
6,444

(b) 
1,110

  
8,200

 
129

 
88

Total Segments
14,074

  
2,841

  
24,690

 
411

 
227

Corporate/Eliminations
(50
)
 
(186
)
 
(4,261
)
(c) 
70

 
75

Total Consolidated
$
14,024

  
$
2,655

  
$
20,429

 
$
481

 
$
302

2016 –
 
 
 
 
 
 
 
 
 
Risk and Insurance Services
$
7,143

(a) 
$
1,581

  
$
14,728

  
$
248

 
$
128

Consulting
6,112

(b) 
1,038

  
6,770

  
121

 
68

Total Segments
13,255

  
2,619

  
21,498

  
369

 
196

Corporate/Eliminations
(44
)
 
(188
)
 
(3,308
)
(c) 
69

 
57

Total Consolidated
$
13,211

  
$
2,431

  
$
18,190

  
$
438

 
$
253

2015 –
 
 
 
 
 
 
 
 
 
Risk and Insurance Services
$
6,869

(a) 
$
1,366

  
$
13,290

  
$
240

 
$
136

Consulting
6,064

(b) 
1,014

  
6,485

  
120

 
108

Total Segments
12,933

  
2,380

  
19,775

  
360

 
244

Corporate/Eliminations
(40
)
 
(196
)
 
(1,559
)
(c) 
63

 
81

Total Consolidated
$
12,893

  
$
2,184

  
$
18,216

  
$
423

 
$
325

(a)
Includes inter-segment revenue of $5 million in 2017 and $6 million in both 2016 and 2015, interest income on fiduciary funds of $39 million, $26 million and $21 million in 2017, 2016 and 2015, respectively, and equity method income of $14 million, $12 million and $6 million in 2017, 2016 and 2015, respectively.
(b)
Includes inter-segment revenue of $45 million, $38 million and $34 million in 2017, 2016 and 2015, respectively, interest income on fiduciary funds of $4 million, $3 million and $4 million in 2017, 2016 and 2015, respectively and equity method income of $17 million, $19 million and $21 million in 2017, 2016 and 2015, respectively.
(c)
Corporate assets primarily include insurance recoverables, pension related assets, the owned portion of the Company headquarters building and intercompany eliminations.
Details of operating segment revenue
Details of operating segment revenue are as follows:  
For the Years Ended December 31,
(In millions of dollars)
2017

 
2016

 
2015

Risk and Insurance Services
 
 
 
 
 
Marsh
$
6,433

 
$
5,997

 
$
5,745

Guy Carpenter
1,197

 
1,146

 
1,124

Total Risk and Insurance Services
7,630

 
7,143

 
6,869

Consulting
 
 
 
 
 
Mercer
4,528

 
4,323

 
4,313

Oliver Wyman Group
1,916

 
1,789

 
1,751

Total Consulting
6,444

 
6,112

 
6,064

Total Segments
14,074

 
13,255

 
12,933

Corporate/Eliminations
(50
)
 
(44
)
 
(40
)
Total
$
14,024

 
$
13,211

 
$
12,893
Information by geographic area
Information by geographic area is as follows: 
For the Years Ended December 31,
(In millions of dollars)
2017

 
2016

 
2015

Revenue
 
 
 
 
 
United States
$
6,870

 
$
6,573

 
$
6,316

United Kingdom
2,112

 
2,019

 
2,036

Continental Europe
2,197

 
2,022

 
1,902

Asia Pacific
1,517

 
1,363

 
1,333

Other
1,378

 
1,278

 
1,346

 
14,074

 
13,255

 
12,933

Corporate/Eliminations
(50
)
 
(44
)
 
(40
)
Total
$
14,024

 
$
13,211

 
$
12,893

For the Years Ended December 31,
(In millions of dollars)
2017

 
2016

 
2015

Fixed Assets, Net
 
 
 
 
 
United States
$
399

 
$
412

 
$
460

United Kingdom
91

 
94

 
115

Continental Europe
57

 
53

 
57

Asia Pacific
78

 
76

 
49

Other
87

 
90

 
92

Total
$
712

 
$
725

 
$
773