Stock Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2015

Stock Compensation Plans [Abstract]

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

Stock-based compensation expense for the following periods was:

In millions	Three months ended March 31
	2015	2014
Restricted stock	$9	$10
Stock options	—	—
Total stock-based compensation (pre-tax)	9	10
Tax benefit	(3)	(4)
Total stock-based compensation (net of tax)	$6	$6