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Retirement Plans - Schedule of Components of Pension Plans (Details) - Pension Plans [Member] - USD ($) $ in Millions | May 31, 2018 | May 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation ("PBO") | $ 24,820 | $ 29,913
Fair Value of Plan Assets | 23,566 | 26,312
Funded Status | (1,254) | (3,601)
Qualified [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation ("PBO") | 22,413 | 27,600
Fair Value of Plan Assets | 22,057 | 24,933
Funded Status | (356) | (2,667)
Nonqualified [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation ("PBO") | 240 | 270
Funded Status | (240) | (270)
International Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Projected Benefit Obligation ("PBO") | 2,167 | 2,043
Fair Value of Plan Assets | 1,509 | 1,379
Funded Status | $ (658) | $ (664)

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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