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INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2019 | May 31, 2018 | May 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 12,688 | $ 12,930 |
Additions & Adjustments, net | [1] | 298 |  |
Retirements |  | (540) |  |
Accumulated Amortization |  | (7,409) | (6,260) |
Expense |  | (1,689) | (1,620) | $ (1,451)
Retirements |  | 540 |  |
Intangible Assets, Net |  | $ 5,279 | 6,670 |
Weighted Average Useful Life | [2] | 3 years |  |
Developed technology [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 5,406 | 5,309 |
Additions & Adjustments, net | [1] | 301 |  |
Retirements |  | (204) |  |
Accumulated Amortization |  | (3,467) | (2,814) |
Expense |  | (857) |  |
Retirements |  | 204 |  |
Intangible Assets, Net |  | $ 1,939 | 2,495 |
Weighted Average Useful Life | [2] | 3 years |  |
Cloud services and license support agreements and related relationships [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 5,693 | 5,999 |
Additions & Adjustments, net | [1] | (20) |  |
Retirements |  | (286) |  |
Accumulated Amortization |  | (2,711) | (2,285) |
Expense |  | (712) |  |
Retirements |  | 286 |  |
Intangible Assets, Net |  | $ 2,982 | 3,714 |
Weighted Average Useful Life | [2] | 4 years |  |
Other [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible Assets, Gross |  | $ 1,589 | 1,622 |
Additions & Adjustments, net | [1] | 17 |  |
Retirements |  | (50) |  |
Accumulated Amortization |  | (1,231) | (1,161) |
Expense |  | (120) |  |
Retirements |  | 50 |  |
Intangible Assets, Net |  | $ 358 | $ 461 |
Weighted Average Useful Life | [2] | 5 years |  |
[1] | Amounts also include immaterial changes, if any, in net intangible asset balances for the periods presented that resulted from foreign currency translations.
[2] | Represents weighted-average useful lives (in years) of intangible assets acquired during fiscal 2019

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