Stock Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2016

Stock Compensation Plans [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan

Stock-based compensation expense for the following periods were:

In millions	Three months ended March 31
	2016	2015
Restricted stock units	$13	$9
Tax benefit	(4)	(3)
Total stock-based compensation (net of tax)	$9	$6