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Employee Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2011
Employee Retirement Plans (Tables) [Abstract] 
Net periodic pension cost for defined-benefit pension plans
                                 
    Three Months Ended September 30,  
    2011     2010  
    Qualified     Non-Qualified     Qualified     Non-Qualified  
Service cost
  $ 1     $     $ 2     $  
Interest cost
    12       2       11       3  
Expected return on plan assets
    (9 )           (9 )      
Amortization of prior service cost
                       
Amortization of net loss
    2       1       3        
 
                       
Net periodic pension cost
  $ 6     $ 3       7       3  
 
                       
                                 
    Nine Months Ended September 30,  
    2011     2010  
    Qualified     Non-Qualified     Qualified     Non-Qualified  
Service cost
  $ 2     $     $ 4     $  
Interest cost
    34       6       34       7  
Expected return on plan assets
    (25 )           (27 )      
Amortization of prior service cost
                       
Amortization of net loss
    7       1       8        
 
                       
Net periodic pension cost
  $ 18     $ 7     $ 19     $ 7