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Investments and Related Matters (Tables)
3 Months Ended
Mar. 31, 2018
Investment Segment  
Schedule of Investments [Line Items]  
Investment [Table Text Block]
 
March 31, 2018
 
December 31, 2017
Assets
(in millions)
Investments:
 
 
 
   Equity securities:
 
 
 
      Basic materials
$
705

 
$
1,170

      Consumer, non-cyclical
2,628

 
2,551

      Consumer, cyclical
1,261

 
777

      Energy
1,453

 
1,489

      Financial
149

 
2,185

      Technology
956

 
833

      Other
208

 
372

 
7,360

 
9,377

   Corporate debt securities
158

 
155

 
$
7,518

 
$
9,532

Liabilities
 
 
 
Securities sold, not yet purchased, at fair value:
 
 
 
   Equity securities:
 
 
 
      Consumer, non-cyclical
$
86

 
$
101

      Consumer, cyclical
127

 
667

      Energy

 
110

      Industrial
68

 
110

 
281

 
988

   Corporate debt securities
18

 
35

 
$
299

 
$
1,023

Other Segments  
Schedule of Investments [Line Items]  
Investment [Table Text Block]
 
March 31, 2018
 
December 31, 2017
 
(in millions)
Equity method investments
$
417

 
$
430

Other investments (measured at fair value)
429

 
407

 
$
846

 
$
837