Interest Expense, Net (Tables)

6 Months Ended

Jun. 30, 2017

Interest Expense, Net

Components of net interest expense

	Three Months Ended				Six Months Ended
	June 30,				June 30,
In millions	2017		2016		2017		2016
Interest expense	$	251	$	284	$	509	$	572
Interest income		(4)		(4)		(10)		(9)
Interest expense, net	$	247	$	280	$	499	$	563