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Strategic Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Investments [Abstract]  
Investment [Table Text Block]
The aggregate carrying amount of our strategic investments was comprised of the following categories:


As of
(in millions)
June 30, 2019
 
December 31, 2018
Equity method investments
$
243

 
$
303

Measurement alternative investments (1)
169

 
94

Publicly-held equity securities (2)
1

 
—

Notes receivable
3

 
26

 
$
415

 
$
424