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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020 and 2019 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
Revenue
 
Operating Income
(Loss)
 
Revenue
 
Operating Income
(Loss)
2020–
 
 
 
 
 
 
 
Risk and Insurance Services
$
2,603

(a) 
$
696

 
$
5,514

(c)  
$
1,550

Consulting
1,616

(b) 
255

 
3,378

(d)  
537

Total Operating Segments
4,219

 
951

 
8,892

 
2,087

Corporate/Eliminations
(30
)
 
(66
)
 
(52
)
 
(132
)
Total Consolidated
$
4,189

 
$
885

 
$
8,840

 
$
1,955

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


(a) Includes inter-segment revenue of $4 million and $3 million in 2020 and 2019, respectively, interest income on fiduciary funds of $9 million and $26 million in 2020 and 2019, respectively, and equity method income of $14 million and $4 million in 2020 and 2019, respectively.
(b) Includes inter-segment revenue of $26 million and $22 million in 2020 and 2019, respectively, interest income on fiduciary funds of less than $1 million and $1 million in 2020 and 2019, respectively, and equity method income of $5 million in 2019.
(c) Includes inter-segment revenue of $5 million and $4 million in 2020 and 2019, respectively, interest income on fiduciary funds of $32 million and $49 million in 2020 and 2019, respectively, and equity method income of $13 million and $6 million in 2020 and 2019, respectively.
(d) Includes inter-segment revenue of $47 million and $46 million in 2020 and 2019, respectively, interest income on fiduciary funds of less than $1 million and $2 million in 2020 and 2019, respectively, and equity method income of $4 million and $10 million in 2020 and 2019, respectively.
Details of Operating Segment Revenue
Details of operating segment revenue for the three and six-month periods ended June 30, 2020 and 2019 are as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(In millions)
2020

 
2019

 
2020

 
2019

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
2,168

 
$
2,174

 
$
4,244

 
$
3,927

Guy Carpenter
435

 
400

 
1,270

 
1,070

Total Risk and Insurance Services
2,603

 
2,574

 
5,514

 
4,997

Consulting
 
 
 
 
 
 
 
Mercer
1,149

 
1,260

 
2,400

 
2,415

Oliver Wyman Group
467

 
540

 
978

 
1,058

Total Consulting
1,616

 
1,800

 
3,378

 
3,473

Total Operating Segments
4,219

 
4,374

 
8,892

 
8,470

Corporate/Eliminations
(30
)
 
(25
)
 
(52
)
 
(50
)
Total
$
4,189

 
$
4,349

 
$
8,840

 
$
8,420