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Retirement Plans | 9 Months Ended
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Feb. 28, 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 periods ended February 28 were as follows (in millions):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Defined benefit pension plans |  | $ | 39 |  |  | $ | 57 |  |  | $ | 113 |  |  | $ | 173 |
Defined contribution plans |  |  | 135 |  |  |  | 117 |  |  |  | 386 |  |  |  | 348 |
Postretirement healthcare plans |  |  | 19 |  |  |  | 19 |  |  |  | 56 |  |  |  | 57 |
|  | $ | 193 |  |  | $ | 193 |  |  | $ | 555 |  |  | $ | 578 |
Net periodic benefit cost of the pension and postretirement healthcare plans for the periods ended February 28 included the following components (in millions):
|  | Three Months Ended |
|  | U.S. Pension Plans |  |  | International Pension Plans |  |  | Postretirement Healthcare Plans |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 169 |  |  | $ | 160 |  |  | $ | 23 |  |  | $ | 20 |  |  | $ | 9 |  |  | $ | 9 |
Interest cost |  |  | 279 |  |  |  | 282 |  |  |  | 12 |  |  |  | 11 |  |  |  | 10 |  |  |  | 10 |
Expected return on plan assets |  |  | (406 | ) |  |  | (375 | ) |  |  | (10 | ) |  |  | (9 | ) |  |  | — |  |  |  | — |
Amortization of prior service credit and other |  |  | (29 | ) |  |  | (30 | ) |  |  | 1 |  |  |  | (2 | ) |  |  | — |  |  |  | — |
|  | $ | 13 |  |  | $ | 37 |  |  | $ | 26 |  |  | $ | 20 |  |  | $ | 19 |  |  | $ | 19 |
|  | Nine Months Ended |
|  | U.S. Pension Plans |  |  | International Pension Plans |  |  | Postretirement Healthcare Plans |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 509 |  |  | $ | 479 |  |  | $ | 69 |  |  | $ | 61 |  |  | $ | 27 |  |  | $ | 27 |
Interest cost |  |  | 836 |  |  |  | 846 |  |  |  | 37 |  |  |  | 33 |  |  |  | 29 |  |  |  | 30 |
Expected return on plan assets |  |  | (1,218 | ) |  |  | (1,126 | ) |  |  | (32 | ) |  |  | (30 | ) |  |  | — |  |  |  | — |
Amortization of prior service credit and other |  |  | (88 | ) |  |  | (89 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | — |
|  | $ | 39 |  |  | $ | 110 |  |  | $ | 74 |  |  | $ | 63 |  |  | $ | 56 |  |  | $ | 57 |
Contributions to our U.S. Pension Plans for the nine-month periods ended February 28 were as follows (in millions):
|  | 2018 |  |  | 2017 |
Required |  | $ | 22 |  |  | $ | 444 |
Voluntary |  |  | 2,478 |  |  |  | 1,306 |
|  | $ | 2,500 |  |  | $ | 1,750 |
During the third quarter of 2018, we made voluntary contributions to our U.S. Pension Plans of $1.75 billion.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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