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Cash And Cash Equivalents (Tables)
 3 Months Ended
Mar. 31, 2017
Cash And Cash Equivalents [Abstract]  
Summary Of Cash And Cash Equivalents



 

 

 

 

 



March 31,

 

December 31,



2017

 

2016



(in millions)



 

 

 

 

 

Cash

$

 265 

 

$

 254 

Marketable securities (1)

 

 1,117 

 

 

 1,169 

Total cash and cash equivalents

$

 1,382 

 

$

 1,423 



(1)

Consists of government stable value money market funds.