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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2019
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 and liabilities measured at fair value on a recurring basis and subject to fair value disclosure requirements at March 31, 2019 and December 31, 2018 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 at March 31, 2019
$
290

 
$
290

 
$
—

 
$
—

Money market funds at December 31, 2018
$
246

 
$
246

 
$
—

 
$
—

Liabilities
 
 
 
 
 
 
 
Interest rate swap at March 31, 2019
$
12

 
$
—

 
$
12

 
$
—

Interest rate swap at December 31, 2018
$
7

 
$
—

 
$
7

 
$
—