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INCOME TAXES - Gross Unrecognized Tax Benefits, Including Acquisitions (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Gross Unrecognized Tax Benefits Including Acquisitions [Abstract] |  |  |
Gross unrecognized tax benefits as of June 1 | $ 5,592 | $ 4,919 | $ 4,561
Increases related to tax positions from prior fiscal years | 772 | 200 | 128
Decreases related to tax positions from prior fiscal years | (135) | (65) | (218)
Increases related to tax positions taken during current fiscal year | 540 | 840 | 595
Settlements with tax authorities | (153) | (42) | (85)
Lapses of statutes of limitation | (202) | (273) | (47)
Cumulative translation adjustments and other, net | (66) |  | (15)
Cumulative translation adjustments and other, net | 0 | 13 |
Total gross unrecognized tax benefits as of May 31 | $ 6,348 | $ 5,592 | $ 4,919

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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