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Retirement Plans | 3 Months Ended
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Aug. 31, 2015
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. O ur retirement plans costs for the three-month periods ended August 31 were as follows (in millions):
|  |  |  |  |  | 2015 |  | 2014
Defined benefit pension plans |  |  |  |  |  |  | $ | 53 |  | $ | (7)
Defined contribution plans |  |  | 102 |  |  | 94
Postretirement healthcare plans |  |  | 21 |  |  | 20
|  |  |  |  |  |  |  | $ | 176 |  | $ | 107
Net periodic benefit cost of the pension and postretirement healthcare plans for the three-month periods ended August 31 includ ed the following components (in millions):
|  | Pension Plans |  | Postretirement Healthcare Plans
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 166 |  | $ | 164 |  | $ | 10 |  | $ | 10
Interest cost |  | 295 |  |  | 275 |  |  | 11 |  |  | 10
Expected return on plan assets |  | (377) |  |  | (420) |  |  | - |  |  | -
Amortization of prior service credit |  | (31) |  |  | (26) |  |  | - |  |  | -
|  | $ | 53 |  | $ | (7) |  | $ | 21 |  | $ | 20
C ontributions to our tax qualified U.S. domestic pension plans (“U.S. Pension Plans”) for the three-month periods ended August 3 1 w ere as follows (in millions):
|  | 2015 |  | 2014 |
Required | $ | 6 |  | $ | 82 |
Voluntary |  | 159 |  |  | 83 |
|  | $ | 165 |  | $ | 165 |
In September 2015, we made an additional required contribution of $165 million to our U.S. Pension Plans. Our U.S. Pension Plans have ample funds to m eet expected benefit payments.

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