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Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) ("AOCI") (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | $ 24,168 |
Translation adjustments | (147) | $ 129
Ending Balance | 24,321 | 19,462
Foreign Currency Translation Loss [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | (785) | (1,207)
Translation adjustments | (147) | 129
Ending Balance | (932) | (1,078)
Retirement Plans Adjustments [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | 53 | 60
Reclassifications from AOCI | (2) | (2)
Ending Balance | 51 | 58
Accumulated Other Comprehensive (Loss) [Member] |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Beginning Balance | (732) | (1,147)
Ending Balance | $ (881) | $ (1,020)

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- Definition Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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