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Strategic Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments [Abstract]  
Investment [Table Text Block]
The aggregate carrying amount of our strategic investments were comprised of the following categories:


As of
(in millions)
September 30, 2018
 
December 31, 2017
Equity method investments
$
291

 
$
209

Measurement alternative investments
73

 
81

Publicly-held securities
1

 
15

Notes receivable
19

 
47

 
$
384

 
$
353