Interest Expense (Tables)

6 Months Ended

Jun. 30, 2015

Interest Income (Expense), Net [Abstract]

Components of net interest expense

The following are the components of net interest expense:

	Three Months Ended June 30,						Six Months Ended June 30,
In millions	2015			2014			2015			2014
Interest expense	$	171		$	161		$	309		$	322
Interest income	(5		)	(3		)	(9		)	(6		)
Interest expense, net	$	166		$	158		$	300		$	316