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Investments and Related Matters (Tables)
 9 Months Ended
Sep. 30, 2017
Investment Segment  
Schedule of Investments [Line Items]  
Investment [Table Text Block]
 
September 30, 2017
 
December 31, 2016
Assets
(in millions)
Investments:
 
 
 
   Equity securities:
 
 
 
      Basic materials
$
867

 
$
963

      Consumer, non-cyclical
2,459

 
2,677

      Energy
1,178

 
1,278

      Financial
2,111

 
2,385

      Technology
908

 
911

      Other
1,020

 
809

 
8,543

 
9,023

 
 
 
 
   Corporate debt securities
473

 
190

 
$
9,016

 
$
9,213

Liabilities
 
 
 
Securities sold, not yet purchased, at fair value:
 
 
 
   Equity securities:
 
 
 
      Consumer, non-cyclical
$
219

 
$
—

      Consumer, cyclical
798

 
968

      Energy
94

 
19

      Industrial
102

 
100

 
1,213

 
1,087

 
 
 
 
   Corporate debt securities
45

 
52

 
$
1,258

 
$
1,139
Other Segments  
Schedule of Investments [Line Items]  
Investment [Table Text Block]
 
September 30, 2017
 
December 31, 2016
 
(in millions)
Equity method investments
$
332

 
$
302

Other investments (measured at fair value)
400

 
366

 
$
732

 
$
668