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Retirement Plans | 3 Months Ended
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Aug. 31, 2018
Compensation And Retirement Disclosure [Abstract] |
Retirement Plans | (6) 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 three-month periods ended August 31 were as follows (in millions):
|  | 2018 |  |  | 2017 |
Defined benefit pension plans, net |  | $ | 28 |  |  | $ | 37 |
Defined contribution plans |  |  | 144 |  |  |  | 127 |
Postretirement healthcare plans |  |  | 19 |  |  |  | 19 |
|  | $ | 191 |  |  | $ | 183 |
Net periodic benefit cost of the pension and postretirement healthcare plans for the three-month periods ended August 31 included the following components (in millions):
|  | U.S. Pension Plans |  |  | International Pension Plans |  |  | Postretirement Healthcare Plans |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 172 |  |  | $ | 170 |  |  | $ | 24 |  |  | $ | 23 |  |  | $ | 9 |  |  | $ | 9 |
Other retirement plans (income) expense: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  |  | 238 |  |  |  | 279 |  |  |  | 13 |  |  |  | 12 |  |  |  | 10 |  |  |  | 10 |
Expected return on plan assets |  |  | (377 | ) |  |  | (406 | ) |  |  | (12 | ) |  |  | (11 | ) |  |  | — |  |  |  | — |
Amortization of prior service credit and other |  |  | (29 | ) |  |  | (30 | ) |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | — |
|  |  | (168 | ) |  |  | (157 | ) |  |  | — |  |  |  | 1 |  |  |  | 10 |  |  |  | 10 |
|  | $ | 4 |  |  | $ | 13 |  |  | $ | 24 |  |  | $ | 24 |  |  | $ | 19 |  |  | $ | 19 |
We made voluntary contributions to our tax-qualified U.S. domestic pension plans (“U.S. Pension Plans”) of $250 million during the first quarters of 2019 and 2018. In September 2018, we made additional voluntary contributions to our U.S. Pension Plans of $250 million.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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