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Investments and Related Matters (Tables)
 12 Months Ended
Dec. 31, 2017
Investment Segment  
Investment and Related Matters [Line Items]  
Investment
 
December 31,
 
2017
 
2016
Assets
(in millions)
Investments:
 
 
 
   Equity securities:
 
 
 
      Basic materials
$
1,170

 
$
963

      Consumer, non-cyclical
2,551

 
2,677

      Energy
1,489

 
1,278

      Financial
2,185

 
2,385

      Technology
833

 
911

      Other
1,149

 
809

 
9,377

 
9,023

   Corporate debt securities
155

 
190

 
$
9,532

 
$
9,213

Liabilities
 
 
 
Securities sold, not yet purchased, at fair value:
 
 
 
   Equity securities:
 
 
 
      Consumer, non-cyclical
$
101

 
$
—

      Consumer, cyclical
667

 
968

      Energy
110

 
19

      Industrial
110

 
100

 
988

 
1,087

   Corporate debt securities
35

 
52

 
$
1,023

 
$
1,139
Other segments  
Investment and Related Matters [Line Items]  
Investment
 
December 31,
 
2017
 
2016
 
(in millions)
Equity method investments
$
430

 
$
302

Other investments (measured at fair value)
407

 
366

 
$
837

 
$
668