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Retirement Plans (Details 1) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013 | May. 31, 2012
Acturial gain/loss by component pre-tax [Abstract] |  |  |  |
Discount rates | $ 791 | $ 705 | $ (1,076) |
Return on assets | (35) | (1,013) | (696) |
Demographic assumptions | 1,434 | $ 323 | $ 404 |
Increase in overall projected benefit obligation | $ 1,200 |  |  |
U.S. pension plan actual rate of return on assets |  | 13.30% | 12.10% |
Weighted Average Discount Rate Percent all pension postretirement plans | 4.38% | 4.57% | 4.76% | 4.44%
Total mark-to-market loss (gain) | $ 2,190 | $ 15 | $ (1,368) |
Pension and Other Postretirement Benefit Expense [Abstract] |  |  |  |
Defined benefit pension plans | (41) | 99 | 163 |
Defined contribution plans | 385 | 363 | 354 |
Postretirement healthcare plans | 81 | 78 | 78 |
Retirement plans mark to market | 2,190 | 15 | (1,368) |
Retirement plans costs | $ 2,615 | $ 555 | $ (773) |

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- Definition The total amount of net periodic benefit cost for pension plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. + References No definition available. + Details
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- Definition The total amount of net periodic benefit cost for defined benefit postretirement healthcare plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, prior service cost or credit, transition asset or obligation, and gain or loss due to settlements or curtailments. + References No definition available. + Details
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- Definition The actual rate of return on U.S. pension plan assets reflecting the average rate of earnings on the funds invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: 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 + Details
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