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Investments and Related Matters (Tables)
 9 Months Ended
Sep. 30, 2018
Investment Segment  
Schedule of Investments [Line Items]  
Investments
 
September 30, 2018
 
December 31, 2017
Assets
(in millions)
Investments:
 
 
 
   Equity securities:
 
 
 
      Basic materials
$
559

 
$
1,170

      Consumer, non-cyclical
2,402

 
2,551

      Consumer, cyclical
1,378

 
777

      Energy
1,870

 
1,489

      Financial
477

 
2,185

      Technology
1,603

 
833

      Other
212

 
372

 
8,501

 
9,377

   Corporate debt securities
210

 
155

 
$
8,711

 
$
9,532

Liabilities
 
 
 
Securities sold, not yet purchased, at fair value:
 
 
 
   Equity securities:
 
 
 
      Consumer, non-cyclical
$
74

 
$
101

      Consumer, cyclical
122

 
667

      Energy
362

 
110

      Industrial
67

 
110

 
625

 
988

   Corporate debt securities
—

 
35

 
$
625

 
$
1,023
Other Segments  
Schedule of Investments [Line Items]  
Investments
 
September 30, 2018
 
December 31, 2017
 
(in millions)
Equity method investments
$
127

 
$
106

Other investments (measured at fair value)
494

 
400

 
$
621

 
$
506