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Employee Benefit Plans (Details Textuals) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended9 Months Ended
Feb. 28, 2011
Sep. 30, 2011
Year
Month
Investment
Employee Benefit Plans (Textuals) [Abstract]  
Stock option granted Less than one million stock options were granted
Shares issued pursuant to stock awards, net, shares60[1]
Weighted-average period over which the unearned stock-based compensation is expected 1.4
Performance Restricted Stock Units [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units granted based on 2010 performance targets 0.2
Restricted Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock units granted based on 2010 performance targets 10.0
Restricted stock units granted, weighted average grant-date fair value per share $ 43.12
[1]Less than one million stock options were granted in the nine months ended September 30, 2011.