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Retirement Plans
 6 Months Ended
Nov. 30, 2014
Retirement Plans [Abstract]  
Retirement Plans

(5) Retirement Plans

 

We sponsor programs that provide retirement benefits to most of our employees. These programs include defined benefit pension plans, defined contribution plans and postretirement healthcare plans. Key terms of our retirement plans are provided in our Annual Report. Our retirement plans costs for the periods ended November 30 were as follows (in millions):

  Three Months Ended Six Months Ended
  2014 2013 2014 2013
U.S. domestic and international pension plans$ 65 $ 121 $ 133 $ 242
U.S. domestic and international defined contribution           
 plans  94   88   188   177
U.S. domestic and international postretirement           
 healthcare plans  20   19   40   39
  $ 179 $ 228 $ 361 $ 458

Net periodic benefit cost of the pension and postretirement healthcare plans for the periods ended November 30 included the following components (in millions):

  Three Months Ended Six Months Ended
Pension Plans2014 2013 2014 2013
 Service cost$ 164 $ 164 $ 328 $ 328
 Interest cost  275   263   550   526
 Expected return on plan assets  (420)   (374)   (840)   (747)
 Recognized actuarial losses and other  46   68   95   135
  $ 65 $ 121 $ 133 $ 242
             
             
  Three Months Ended Six Months Ended
Postretirement Healthcare Plans2014 2013 2014 2013
 Service cost$ 10 $ 9 $ 20 $ 19
 Interest cost  10   10   20   20
  $ 20 $ 19 $ 40 $ 39

Contributions to our tax qualified U.S. domestic pension plans (“U.S. Pension Plans”) for the six-month periods ended November 30 were as follows:

  2014 2013 
Required$ 247 $ 315 
Voluntary  83   15 
  $ 330 $ 330 

In December 2014, we made an additional contribution of $165 million to our U.S. Pension Plans. Our U.S. Pension Plans have ample funds to meet expected benefit payments. Following this December 2014 payment, for the remainder of 2015, we have no required contributions to our U.S. Pension Plans; however, we expect to make approximately $160 million in voluntary contributions to our U.S. Pension Plans.