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Pension Plans and Other Postretirement Benefits
3 Months Ended
Mar. 31, 2013
Disclosure Text Block [Abstract]  
Pension Plans and Other Postretirement Benefits

15.  Pension Plans and Other Postretirement Benefits

 

       The Company has contributory and non-contributory defined-benefit pension plans, which include both qualified and supplemental plans. The Company also provides certain health care and life insurance benefits for certain retired employees. Retiree health care benefits are funded by contributions from the retiree, and in certain circumstances, contributions from the Company. The Company's retiree life insurance plan is noncontributory.

       The following summarizes the Company's pension and other postretirement benefit cost:

  Pension Benefits Other Benefits
millions2013 2012 2013 2012
Three Months Ended March 31           
Service cost$21 $19 $2 $2
Interest cost 20  21  4  4
Expected return on plan assets (23)  (23)    
Amortization of net actuarial loss (gain) 29  23    
Net periodic benefit cost$47 $40 $6 $6