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Leasing (Tables)
 9 Months Ended
Sep. 30, 2015
Leases [Abstract]  
Schedule of Rent Expense
The following table is a summary of the Company’s net rental expense for operating leases:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
In millions
2015
 
2014
 
2015
 
2014
Minimum rentals
$
576

 
$
569

 
$
1,721

 
$
1,692

Contingent rentals
9

 
9

 
25

 
26

 
585

 
578

 
1,746

 
1,718

Less: sublease income
(5
)
 
(5
)
 
(16
)
 
(16
)
 
$
580

 
$
573

 
$
1,730

 
$
1,702