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Segment Information (Tables)
9 Months Ended
Sep. 30, 2011
Segment Information [Abstract] 
Selected Information And Details For MMC's Operating Segments
  
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions of dollars)
Revenue

 
Operating
Income
(Loss)

 
Revenue

 
Operating
Income
(Loss)

2011 –
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,475

(a) 
$
186

 
$
4,729

(c) 
$
925

Consulting
1,339

(b) 
161

 
3,919

(d) 
441

Total Operating Segments
2,814

  
347

 
8,648

  
1,366

Corporate / Eliminations
(8
)
 
(37
)
 
(30
)
 
(119
)
Total Consolidated
$
2,806

  
$
310

 
$
8,618

  
$
1,247

2010 –
 
 
 
 
 
 
 
Risk and Insurance Services
$
1,327

(a) 
$
142

 
$
4,278

(c) 
$
747

Consulting
1,203

(b) 
138

 
3,526

(d) 
(21
)
Total Operating Segments
2,530

  
280

 
7,804

  
726

Corporate / Eliminations
(6
)
 
(41
)
 
(39
)
 
(112
)
Total Consolidated
$
2,524

  
$
239

 
$
7,765

  
$
614

(a) 
Includes inter-segment revenue of $2 million and $4 million in 2011 and 2010, respectively, interest income on fiduciary funds of $14 million and $11 million in 2011 and 2010, respectively, and equity method income of $1 million in both 2011 and 2010 .
(b) 
Includes inter-segment revenue of $6 million and $2 million in 2011 and 2010, respectively, and interest income on fiduciary funds of $1 million in both 2011 and 2010.
(c) 
Includes inter-segment revenue of $4 million and $6 million in 2011 and 2010, respectively, interest income on fiduciary funds of $36 million and $33 million in 2011 and 2010, respectively, and equity method income of $10 million and $9 million in 2011 and 2010, respectively.
(d) 
Includes inter-segment revenue of $26 million and $33 million in 2011 and 2010, respectively, and interest income on fiduciary funds of $3 million in both 2011 and 2010.
Details Of Operating Segment Revenue
  
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
(In millions of dollars)
2011

 
2010

 
2011

 
2010

Risk and Insurance Services
 
 
 
 
 
 
 
Marsh
$
1,221

 
$
1,092

 
$
3,875

 
$
3,481

Guy Carpenter
254

 
235

 
854

 
797

Total Risk and Insurance Services
1,475

 
1,327

 
4,729

 
4,278

Consulting
 
 
 
 
 
 
 
Mercer
975

 
881

 
2,842

 
2,568

Oliver Wyman Group
364

 
322

 
1,077

 
958

Total Consulting
1,339

 
1,203

 
3,919

 
3,526

Total Operating Segments
2,814

 
2,530

 
8,648

 
7,804

Corporate/ Eliminations
(8
)
 
(6
)
 
(30
)
 
(39
)
Total
$
2,806

 
$
2,524

 
$
8,618

 
$
7,765