Stock Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2012

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

As of June 30, 2012, the Company’s primary types of stock-based compensation were restricted stock and stock options. Stock-based compensation expense for the following periods was:



In millions	Three months ended June 30		Six months ended June 30
In millions	2012	2011	2012	2011
Restricted stock	$10	$6	$20	$12
Stock options	1	2	2	3
Total stock-based compensation (pre-tax)	11	8	22	15
Tax benefit	(4)	(3)	(7)	(5)
Total stock-based compensation (net of tax)	$7	$5	$15	$10

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The weighted average fair value of option grants was estimated based on the below weighted average assumptions and was $8.17 and $7.38 for the six months ended June 30, 2012 and 2011.



	Three months ended June 30		Six months ended June 30
	2012	2011	2012	2011
Dividend yield	—	—	—	—
Risk-free interest rate	0.80%	1.95%	0.80%	2.04%
Expected volatility	40.1%	40.0%	40.1%	40.4%
Expected holding period (years)	5.0	5.1	5.0	5.1