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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
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 March 31, 2018 and December 31, 2017 were as follows:
 
 
 
Fair Value Measurements at Reporting Date Using
In millions
Total
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Assets
 
 
 
 
 
 
 
Money market funds, March 31, 2018
$
326

 
$
326

 
$

 
$

Money market funds, December 31, 2017
$
501

 
$
501

 
$

 
$