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Employee Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2011
Employee Retirement Plans (Tables) [Abstract]  
Net periodic pension cost for defined-benefit pension plans
                                 
    Three Months Ended June 30,  
    2011     2010  
    Qualified     Non-Qualified     Qualified     Non-Qualified  
Service cost
  $ —     $ —     $ 1     $ —  
Interest cost
    11       2       12       2  
Expected return on plan assets
    (8 )     —       (10 )     —  
Amortization of prior service cost
    —       —       —       —  
Amortization of net loss
    3       —       3       —  
 
                       
Net periodic pension cost
  $ 6     $ 2       6       2  
 
                       
                                 
    Six Months Ended June 30,
    2011   2010
    Qualified   Non-Qualified   Qualified   Non-Qualified
Service cost
  $ 1     $ —     $ 2     $ —  
Interest cost
    22       4       23       4  
Expected return on plan assets
    (16 )     —       (18 )     —  
Amortization of prior service cost
    —       —       —       —  
Amortization of net loss
    5       —       5       —  
 
                       
Net periodic pension cost
  $ 12     $ 4     $ 12     $ 4