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Retirement Plans (Details 2) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2016 | May 31, 2015 | May 31, 2016 | May 31, 2015 | May 31, 2014 | May 31, 2013
Acturial gain/loss by component pre-tax [Abstract] |  |  |  |  |  |
Actual versus expected return on assets |  |  | $ 1,285 | $ (35) | $ (1,013) |
Discount rate changes |  |  | 1,129 | 791 | 705 |
Demographic assumption experience |  |  | (916) | 1,434 | 323 |
Total mark-to-market loss | $ 1,500 | $ 2,200 | $ 1,498 | 2,190 | $ 15 |
Increase in overall projected benefit obligation due to new mortality table. |  |  |  | $ 1,200 |  |
U.S. pension plan actual rate of return on assets |  |  | 1.20% |  | 13.30% |
Weighted Average Discount Rate Percent all pension postretirement plans |  |  | 4.04% | 4.38% | 4.57% | 4.76%

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- Definition The amount of actuarial gain/loss attributable to the discount rate. + References No definition available. + Details
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- Definition The amount of increase to the overal projected benefit obligation due to mortality assumption change. + References No definition available. + Details
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- Definition The annual retirement plan amount recorded for actuarial gains and losses calculated using actual fair value of plan assets. + References No definition available. + Details
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- Definition The amount of actuarial gain/loss attributable to the return on assets. + 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 weighted average interest rate used to adjust for the time value of money for all pension and postretirement plans. + References No definition available. + Details
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