Stock Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2011

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

As of June 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 June 30		Six months ended June 30
In millions	2011	2010	2011	2010
Stock options	$2	$2	$3	$2
Restricted stock	6	5	12	7
Total stock-based compensation (pre-tax)	8	7	15	9
Tax benefit	(3)	(2)	(5)	(3)
Total stock-based compensation (net of tax)	$5	$5	$10	$6

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 six months ended June 30, 2011 and 2010, respectively.



	Three months ended June 30		Six months ended June 30
	2011	2010	2011	2010
Dividend yield	—	—	—	—
Risk-free interest rate	1.95%	2.43%	2.04%	2.35%
Expected volatility	40.0%	44.0%	40.4%	47.1%
Expected holding period (years)	5.1	4.8	5.1	4.8