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Retirement Plans | 6 Months Ended
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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. O ur 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 includ ed the following components (in millions):
|  | Three Months Ended |  | Six Months Ended
Pension Plans | 2016 |  | 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 Plans | 2016 |  | 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 201 6, 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.

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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 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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