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Segment Information (Tables)
 6 Months Ended
Jun. 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 six-month periods ended June 30, 2019 and 2018 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
Revenue
 
Operating Income
(Loss)
 
Revenue
 
Operating Income
(Loss)
2019–
 
 
 
 
 
 
 
Risk and Insurance Services
$
2,574

(a) 
$
517

 
$
4,997

(c)  
$
1,250

Consulting
1,800

(b) 
278

 
3,473

(d)  
557

Total Operating Segments
4,374

 
795

 
8,470

 
1,807

Corporate/Eliminations
(25
)
 
(115
)
 
(50
)
 
(189
)
Total Consolidated
$
4,349

 
$
680

 
$
8,420

 
$
1,618

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


(a) Includes inter-segment revenue of $3 million in 2019, respectively, interest income on fiduciary funds of $26 million and $15 million in 2019 and 2018, respectively, and equity method income of $4 million and $7 million in 2019 and 2018, respectively.
(b) Includes inter-segment revenue of $22 million and $12 million in 2019 and 2018, respectively, interest income on fiduciary funds of $1 million in 2019 and 2018, respectively, and equity method income of $5 million in both 2019 and in 2018.
(c) Includes inter-segment revenue of $4 million and $1 million in 2019 and 2018, respectively, interest income on fiduciary funds of $49 million and $28 million in 2019 and 2018, respectively, and equity method income of $6 million in both 2019 and 2018.
(d) Includes inter-segment revenue of $46 million and $23 million in 2019 and 2018, respectively, interest income on fiduciary funds of $2 million in both 2019 and 2018, and equity method income of $10 million and $8 million in 2019 and in 2018, respectively.
Details of Operating Segment Revenue
Details of operating segment revenue for the three and six-month periods ended June 30, 2019 and 2018 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
2019

 
2018

 
2019

 
2018

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
2,174

 
$
1,760

 
$
3,927

 
$
3,463

Guy Carpenter
400

 
336

 
1,070

 
977

Total Risk and Insurance Services
2,574

 
2,096

 
4,997

 
4,440

Consulting
 
 
 
 
 
 
 
Mercer
1,260

 
1,158

 
2,415

 
2,329

Oliver Wyman Group
540

 
492

 
1,058

 
989

Total Consulting
1,800

 
1,650

 
3,473

 
3,318

Total Operating Segments
4,374

 
3,746

 
8,470

 
7,758

Corporate/Eliminations
(25
)
 
(12
)
 
(50
)
 
(24
)
Total
$
4,349

 
$
3,734

 
$
8,420

 
$
7,734