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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2013
Employee Benefit Plans [Abstract]  
Employee Benefit Plans
Note 19—Employee Benefit Plans            
             
Pension and Postretirement Plans            
 Millions of Dollars
  Pension Benefits Other Benefits
Three Months EndedMarch 31 March 31
 2013 2012 2013 2012
 U.S. Int’l. U.S. Int’l.    
Components of Net Periodic Benefit Cost            
Service cost$ 35  26  58  28  1  2
Interest cost  36  37  63  43  6  10
Expected return on plan assets  (47)  (41)  (74)  (43)  -  -
Amortization of prior service cost (credit)  1  (2)  2  (2)  (1)  (1)
Recognized net actuarial loss (gain)  38  19  59  18  1  (1)
Net periodic benefit cost$ 63  39  108  44  7  10

In connection with the separation of the Downstream business on April 30, 2012, ConocoPhillips entered into an Employee Matters Agreement with Phillips 66 which provides that employees of Phillips 66 will no longer participate in benefit plans sponsored or maintained by ConocoPhillips upon separation.  As such, changes in net periodic benefit cost included in the table above primarily relate to the employees of Phillips 66 no longer participating in the ConocoPhillips benefit plans for the three-month period ended March 31, 2013.

 

During the first three months of 2013, we contributed $52 million to our domestic benefit plans and $50 million to our international benefit plans.