Stock Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2011

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

As of September 30, 2011, the Company’s primary types of stock-based compensation were stock options and restricted stock. Stock-based compensation expense for the following periods was:



In millions	Three months ended September 30		Nine months ended September 30
In millions	2011	2010	2011	2010
Stock options	$2	$2	$5	$4
Restricted stock	7	4	19	11
Total stock-based compensation (pre-tax)	9	6	24	15
Tax benefit	(2)	(2)	(7)	(5)
Total stock-based compensation (net of tax)	$7	$4	$17	$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 $7.38 and $5.49 for the nine months ended September 30, 2011 and 2010, respectively. There were no stock options granted in the three months ended September 30, 2011.



	Three months ended September 30		Nine months ended September 30
	2011	2010	2011	2010
Dividend yield	—	—	—	—
Risk-free interest rate	—	1.60%	2.04%	2.31%
Expected volatility	—	43.8%	40.4%	46.9%
Expected holding period (years)	—	4.8	5.1	4.8