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Stock Compensation Plans (Details) (Textual) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Stock Compensation Plans (Textuals) [Abstract]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 12.94  
Weighted average fair value per share for the stock, other than option $ 13.57  
Weighted average fair value per share for the stock options $ 6.37  
Stock-based compensation expense recognized $ 1 $ 6
Unearned compensation cost related to the unvested portion of all stock-based awards $ 34  
Performance Plan 2008 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted 1.8  
Granted, other than options 0.2