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Retirement Plans | 9 Months Ended
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Feb. 28, 2017
Compensation And Retirement Disclosure [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 February 28, 2017 and February 29, 2016 were as follows (in millions):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Defined benefit pension plans |  | $ | 57 |  |  | $ | 53 |  |  | $ | 173 |  |  | $ | 160 |
Defined contribution plans |  |  | 117 |  |  |  | 104 |  |  |  | 348 |  |  |  | 304 |
Postretirement healthcare plans |  |  | 19 |  |  |  | 20 |  |  |  | 57 |  |  |  | 61 |
|  | $ | 193 |  |  | $ | 177 |  |  | $ | 578 |  |  | $ | 525 |
Net periodic benefit cost of the pension and postretirement healthcare plans for the periods ended February 28, 2017 and February 29, 2016 included the following components (in millions):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Pension Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 180 |  |  | $ | 166 |  |  | $ | 540 |  |  | $ | 497 |
Interest cost |  |  | 293 |  |  |  | 295 |  |  |  | 879 |  |  |  | 885 |
Expected return on plan assets |  |  | (384 | ) |  |  | (377 | ) |  |  | (1,156 | ) |  |  | (1,131 | )
Amortization of prior service credit and other |  |  | (32 | ) |  |  | (31 | ) |  |  | (90 | ) |  |  | (91 | )
|  | $ | 57 |  |  | $ | 53 |  |  | $ | 173 |  |  | $ | 160 |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Postretirement Healthcare Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 9 |  |  | $ | 10 |  |  | $ | 27 |  |  | $ | 30 |
Interest cost |  |  | 10 |  |  |  | 10 |  |  |  | 30 |  |  |  | 31 |
|  | $ | 19 |  |  | $ | 20 |  |  | $ | 57 |  |  | $ | 61 |
Contributions to our U.S. Pension Plans for the nine-month periods ended February 28, 2017 and February 29, 2016 were as follows (in millions):
|  | 2017 |  |  | 2016 |
Required |  | $ | 444 |  |  | $ | 8 |
Voluntary |  |  | 1,306 |  |  |  | 487 |
|  | $ | 1,750 |  |  | $ | 495 |
In March 2017, we made $250 million in contributions to our U.S. Pension Plans, of which $15 million was required. Our U.S. Pension Plans have ample funds to meet expected benefit payments. We anticipate our U.S. Pension Plans will make payments in the fourth quarter of 2017 aggregating in excess of $1 billion to former employees who elected to receive their benefits early under a voluntary program offered to qualifying participants during the third quarter of 2017.

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