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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019 and 2018 are as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions)
Revenue
 
Operating Income
(Loss)
 
Revenue
 
Operating Income
(Loss)
2019–
 
 
 
 
 
 
 
Risk and Insurance Services
$
2,206

(a) 
$
218

 
$
7,203

(c)  
$
1,468

Consulting
1,785

(b) 
317

 
5,258

(d)  
874

Total Operating Segments
3,991

 
535

 
12,461

 
2,342

Corporate/Eliminations
(23
)
 
(68
)
 
(73
)
 
(257
)
Total Consolidated
$
3,968

 
$
467

 
$
12,388

 
$
2,085

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


(a) Includes inter-segment revenue of $3 million and $4 million in 2019 and 2018, respectively, interest income on fiduciary funds of $31 million and $18 million in 2019 and 2018, respectively, and equity method income of $10 million and $4 million in 2019 and 2018, respectively and $51 million related to the sale of business in 2018.
(b) Includes inter-segment revenue of $20 million and $11 million in 2019 and 2018, respectively, interest income on fiduciary funds of $1 million in 2018, and equity method income of $4 million in 2018.
(c) Includes inter-segment revenue of $7 million and $5 million in 2019 and 2018, respectively, interest income on fiduciary funds of $80 million and $46 million in 2019 and 2018, respectively, and equity method income of $16 million and $10 million in 2019 and 2018, respectively and $51 million related to the sale of business in 2018.
(d) Includes inter-segment revenue of $66 million and $34 million in 2019 and 2018, respectively, interest income on fiduciary funds of $2 million and $3 million in 2019 and 2018, respectively and equity method income of $10 million and $12 million in 2019 and in 2018, respectively.
Details of Operating Segment Revenue
Details of operating segment revenue for the three and nine-month periods ended September 30, 2019 and 2018 are as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions)
2019

 
2018

 
2019

 
2018

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
1,923

 
$
1,643

 
$
5,850

 
$
5,106

Guy Carpenter
283

 
220

 
1,353

 
1,197

Total Risk and Insurance Services
2,206

 
1,863

 
7,203

 
6,303

Consulting
 
 
 
 
 
 
 
Mercer
1,280

 
1,175

 
3,695

 
3,504

Oliver Wyman Group
505

 
481

 
1,563

 
1,470

Total Consulting
1,785

 
1,656

 
5,258

 
4,974

Total Operating Segments
3,991

 
3,519

 
12,461

 
11,277

Corporate/Eliminations
(23
)
 
(15
)
 
(73
)
 
(39
)
Total
$
3,968

 
$
3,504

 
$
12,388

 
$
11,238