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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Assets and Liabilities Measured at Fair Value on Recurring Basis and Subject to Fair Value Disclosure Requirements
The Company’s assets measured at fair value on a recurring basis and subject to fair value disclosure requirements at December 31, were as follows: 
 
 
 
Fair Value Measurements at Reporting Date Using
 
 
 
Quoted Prices 
in Active Markets
for Identical
Assets
 
Significant
Other
Observable
Inputs
 
Significant Unobservable Inputs
In millions
Total
 
(Level 1)
 
(Level 2)
 
(Level 3)
Assets
 
 
 
 
 
 
 
Money market funds at December 31, 2017
$
501

 
$
501

 
$
—

 
$
—

Money market funds at December 31, 2016
$
473

 
$
473

 
$
—

 
$
—