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Strategic Investments (Tables)
 3 Months Ended
Mar. 31, 2019
Investments [Abstract]  
Investment [Table Text Block]
The aggregate carrying amount of our strategic investments were comprised of the following categories:


As of
(in millions)
March 31, 2019
 
December 31, 2018
Equity method investments
$
199

 
$
303

Measurement alternative investments (1)
112

 
94

Publicly-held equity securities (2)
1

 
—

Notes receivable
31

 
26

 
$
342

 
$
424