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Retirement Plans (Details 11) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 18, 2016 | May 31, 2016 | May 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company Contributions |  | $ 660 | $ 660
U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Contributions By Employer in 2017 | $ 1,000 |  |
Required [Member] | U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company Contributions |  | 8 | 388
Defined Benefit Plan Contributions By Employer in 2017 | $ 615 |  |
Voluntary [Member] | U.S. Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company Contributions |  | $ 652 | $ 272

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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