Stock Compensation Plans (Tables)

3 Months Ended

Mar. 31, 2012

Stock Compensation Plans [Abstract]

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

As of March 31, 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 March 31
	2012	2011
Restricted stock	$10	$6
Stock options	1	1
Total stock-based compensation (pre-tax)	11	7
Tax benefit	(3)	(2)
Total stock-based compensation (net of tax)	$8	$5

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 $7.41 for the three months ended March 31, 2011. There were no stock options granted in the three months ended March 31, 2012.

	Three months ended March 31
	2012	2011
Dividend yield	—	—
Risk-free interest rate	—	2.17%
Expected volatility	—	41.0%
Expected holding period (years)	—	5.1