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Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
The following table presents the details of our investments:
 
September 30,
2018
 
December 31,
2017
 
(in millions)
Trading securities
$
202

 
$
221

Available-for-sale investment securities
—

 
14

Financial investments, at fair value
$
202

 
$
235

 
 
 
 
Equity method investments
$
131

 
$
131

Equity securities
$
76

 
$
152