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Debt (Tables)
12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Annual Contractual Maturities of Principal on Debt Outstanding
Annual contractual maturities of principal on term loan outstanding at December 31, 2015, are as follows: 
In millions
 
2016
$
30

2017
30

2018
60

2019
67

2020
413

Total
$
600

Interest Expense on Borrowings
The following table presents interest expense on borrowings for the years ended December 31:
In millions
2015
 
2014
 
2013
Interest expense
$
9

 
$
3

 
$
4