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Investments (Tables)
 9 Months Ended
Sep. 30, 2019
Investment Segment  
Schedule of Investments [Line Items]  
Investments
 
September 30, 2019
 
December 31, 2018
Assets
(in millions)
Investments:
 
 
 
   Equity securities:
 
 
 
      Basic materials
$
262

 
$
414

      Consumer, non-cyclical
1,704

 
2,161

      Consumer, cyclical
2,149

 
1,161

      Energy
1,943

 
1,598

      Financial
264

 
167

      Technology
2,092

 
1,040

      Other
135

 
145

 
8,549

 
6,686

   Corporate debt securities
169

 
181

 
$
8,718

 
$
6,867

Liabilities
 
 
 
Securities sold, not yet purchased, at fair value:
 
 
 
   Equity securities:
 
 
 
      Consumer, non-cyclical
$
12

 
$
57

      Consumer, cyclical
93

 
106

      Energy
118

 
305

 
$
223

 
$
468
Other Segments and Holding Company  
Schedule of Investments [Line Items]  
Investments
 
September 30, 2019
 
December 31, 2018
 
(in millions)
Equity method investments
$
199

 
$
143

Other investments (measured at fair value)
520

 
1,327

 
$
719

 
$
1,470