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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2011
Retirement Plans [Abstract]  
Components of net periodic pension cost
                                             
    Three Months     Six Months  
    Ended June 30,     Ended June 30,  
    2011     2010     2011     2010  
    (Millions of dollars)  
Service cost
  $ 14     $ 12     $ 28     $ 24  
Interest cost
    22       21       44       43  
Expected return on plan assets
    (27 )     (21 )     (54 )     (42 )
Amortization of net loss
    11       12       22       24  
 
                       
Pension expense
  $ 20     $ 24     $ 40     $ 49