Interest Expense

6 Months Ended

Jun. 30, 2013

Interest Income (Expense), Net [Abstract]

Interest Expense

Interest Expense

The following are the components of net interest expense:

	Three Months Ended June 30,					Six Months Ended June 30,
In millions	2013			2012		2013			2012
Interest expense	$	127		$	132	$	254		$	264
Interest income	(1		)	—		(2		)	(1		)
Interest expense, net	$	126		$	132	$	252		$	263