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Investments (Tables)
 6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Trading Securities [Table Text Block]
The following table summarizes the fair value of investments held as of June 30, 2015 and December 31, 2014 (in millions):

 
 
June 30, 2015
 
December 31, 2014
Debt securities
 
$
69

 
$
—

Equity securities
 
52

 
—

Total
 
$
121

 
$
—