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


As of
(in millions)
June 30, 2018
 
December 31, 2017
Equity method investments
$
281

 
$
209

Measurement alternative investments
82

 
81

Publicly-held securities
1

 
15

Notes receivable
18

 
47

 
$
382

 
$
353