Interest Expense (Tables)

6 Months Ended

Jun. 30, 2016

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	2016			2015			2016			2015
Interest expense	$	284		$	171		$	572		$	309
Interest income	(4		)	(5		)	(9		)	(9		)
Interest expense, net	$	280		$	166		$	563		$	300