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Retirement Plans | 9 Months Ended
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Feb. 28, 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 periods ended February 28 were as follows (in millions):
|  | Three Months Ended |  | Nine Months Ended
|  | 2015 |  | 2014 |  | 2015 |  | 2014
U.S. domestic and international pension plans | $ | 66 |  | $ | 124 |  | $ | 199 |  | $ | 366
U.S. domestic and international defined contribution |  |  |  |  |  |  |  |  |  |  |
| plans |  | 96 |  |  | 90 |  |  | 284 |  |  | 269
U.S. domestic and international postretirement |  |  |  |  |  |  |  |  |  |  |
| healthcare plans |  | 21 |  |  | 20 |  |  | 61 |  |  | 59
|  | $ | 183 |  | $ | 234 |  | $ | 544 |  | $ | 694
Net periodic benefit cost of the pension and postretirement healthcare plans for the periods ended February 28 includ ed the following components (in millions):
|  | Three Months Ended |  | Nine Months Ended
Pension Plans | 2015 |  | 2014 |  | 2015 |  | 2014
| Service cost | $ | 165 |  | $ | 164 |  | $ | 493 |  | $ | 492
| Interest cost |  | 274 |  |  | 264 |  |  | 824 |  |  | 790
| Expected return on plan assets |  | (420) |  |  | (374) |  |  | (1,260) |  |  | (1,121)
| Recognized actuarial losses and other |  | 47 |  |  | 70 |  |  | 142 |  |  | 205
|  | $ | 66 |  | $ | 124 |  | $ | 199 |  | $ | 366
|  | Three Months Ended |  | Nine Months Ended
Postretirement Healthcare Plans | 2015 |  | 2014 |  | 2015 |  | 2014
| Service cost | $ | 10 |  | $ | 10 |  | $ | 30 |  | $ | 29
| Interest cost |  | 11 |  |  | 10 |  |  | 31 |  |  | 30
|  | $ | 21 |  | $ | 20 |  | $ | 61 |  | $ | 59
Contributions to our tax qualified U.S. domestic pension plans (“U.S. Pension Plans”) for the nine months ended February 28 were as follows:
|  | 2015 |  | 2014 |
Required | $ | 380 |  | $ | 480 |
Voluntary |  | 115 |  |  | 15 |
|  | $ | 495 |  | $ | 495 |
In March 2015, we made approximately $160 million in voluntary contribution s to our U.S. Pension Plans. 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 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 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=35743120&loc=d3e2410-114920 Reference 3: 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=35742057&loc=SL14450702-114947 Reference 4: 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=6414199&loc=d3e39622-114963 Reference 5: 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 + Details
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