|
Stock-Based Compensation (Details Textuals) (USD $)
In Millions, except Share data, unless otherwise specified |
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2012
|
Sep. 30, 2011
|
|
| Schedule of Stock Based Compensation [Line Items] | ||
| Weighted Average Remaining Contractual Life for Exercisable Shares | 4 years 5 months 20 days | |
| Non Vested Stock Options | 201,344 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number | 332,026 | |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value | $ 21 | |
| Stock or Unit Option Plan Expense | 0.5 | 1.0 |
| Unrecognized Compensation Cost | $ 69 | |
| Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition | 1 year 2 months 20 days | |