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Retirement Plans
 6 Months Ended
Nov. 30, 2016
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
  2016 2015 2016 2015
Defined benefit pension plans$ 58 $ 54 $ 116 $ 107
Defined contribution plans  112   103   231   205
Postretirement healthcare plans  19   20   38   41
  $ 189 $ 177 $ 385 $ 353

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 Plans2016 2015 2016 2015
 Service cost$ 180 $ 165 $ 360 $ 331
 Interest cost  293   295   586   590
 Expected return on plan assets  (386)   (377)   (772)   (754)
 Amortization of prior service credit and other  (29)   (29)   (58)   (60)
  $ 58 $ 54 $ 116 $ 107
             
             
  Three Months Ended Six Months Ended
Postretirement Healthcare Plans2016 2015 2016 2015
 Service cost$ 9 $ 10 $ 18 $ 20
 Interest cost  10   10   20   21
  $ 19 $ 20 $ 38 $ 41

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 (in millions):

  2016 2015 
Required$ 250 $ 8 
Voluntary  250   322 
  $ 500 $ 330 

In December 2016, we made $250 million in contributions to our U.S. Pension Plans, of which $178 million was required. Our U.S. Pension Plans have ample funds to meet expected benefit payments.