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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 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 June 30, 2017 and December 31, 2016 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, June 30, 2017
$
489

 
$
489

 
$
—

 
$
—

Money market funds, December 31, 2016
$
473

 
$
473

 
$
—

 
$
—