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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2020
Segment Reporting [Abstract]  
Selected Information And Details For MMC's Operating Segments
Selected information about the Company’s operating segments for the three-month periods ended March 31, 2020 and 2019 are as follows:
 
Three Months Ended
March 31,
(In millions)
Revenue
 
Operating Income
(Loss)
2020–
 
 
 
Risk and Insurance Services
$
2,911

(a) 
$
854

Consulting
1,762

(b) 
282

Total Operating Segments
4,673

 
1,136

Corporate/Eliminations
(22
)
 
(66
)
Total Consolidated
$
4,651

 
$
1,070

2019–
 
 
 
Risk and Insurance Services
$
2,423

(a) 
$
733

Consulting
1,673

(b) 
279

Total Operating Segments
4,096

 
1,012

Corporate/Eliminations
(25
)
 
(74
)
Total Consolidated
$
4,071

 
$
938


(a) Includes inter-segment revenue of $1 million in both 2020 and 2019, interest income on fiduciary funds of $23 million in both 2020 and 2019 and equity method loss of $1 million in 2020 and equity method income of $2 million in 2019.
(b) Includes inter-segment revenue of $21 million and $24 million in 2020 and 2019, respectively, interest income on fiduciary funds of $1 million in both 2020 and 2019, and equity method income of $4 million and $5 million in 2020 and 2019, respectively.
Details of Operating Segment Revenue
Details of operating segment revenue for the three-month periods ended March 31, 2020 and 2019 are as follows:
 
Three Months Ended
March 31,
(In millions)
2020

 
2019

Risk and Insurance Services
 
 
 
Marsh
$
2,076

 
$
1,753

Guy Carpenter
835

 
670

Total Risk and Insurance Services
2,911

 
2,423

Consulting
 
 
 
Mercer
1,251

 
1,155

Oliver Wyman Group
511

 
518

Total Consulting
1,762

 
1,673

Total Operating Segments
4,673

 
4,096

Corporate/Eliminations
(22
)
 
(25
)
Total
$
4,651

 
$
4,071