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Interest Expense (Tables)
 9 Months Ended
Sep. 30, 2013
Interest Income (Expense), Net [Abstract]  
Components of net interest expense
The following are the components of net interest expense:
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
In millions
2013
 
2012
 
2013
 
2012
Interest expense
$
125

 
$
135

 
$
379

 
$
399

Interest income
(3
)
 
(1
)
 
(5
)
 
(2
)
Interest expense, net
$
122

 
$
134

 
$
374

 
$
397