Interest Expense (Tables)

9 Months Ended

Sep. 30, 2011

Interest Expense

Components of net interest expense

	Three Months Ended September 30,				Nine Months Ended September 30,
In millions	2011		2010		2011		2010
Interest expense	$	156	$	138	$	440	$	402
Interest income	(1)		(1)		(3)		(3)
Interest expense, net	$	155	$	137	$	437	$	399