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Retirement Plans - Schedule of Components of Pension Plans (Details) - Pension Plans [Member] - USD ($) $ in Millions | May 31, 2019 | May 31, 2018 | May 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected Benefit Obligation ("PBO") | $ 28,855 | $ 24,820 |
Fair Value of Plan Assets | 24,898 | 23,566 |
Funded Status | (3,957) | (1,254) |
Qualified [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected Benefit Obligation ("PBO") | 26,300 | 22,413 |
Fair Value of Plan Assets | 23,320 | 22,057 |
Funded Status | (2,980) | (356) |
Nonqualified [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected Benefit Obligation ("PBO") | 254 | 240 |
Funded Status | (254) | (240) |
International Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected Benefit Obligation ("PBO") | 2,301 | 2,167 | $ 2,043
Fair Value of Plan Assets | 1,578 | 1,509 | $ 1,379
Funded Status | $ (723) | $ (658) |

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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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