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STOCKHOLDERS' EQUITY (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |
Total stock-based compensation | $ 488 | $ 397 | $ 916 | $ 843
Cloud services and license support [Member] |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |
Total stock-based compensation | 36 | 30 | 66 | 61
Hardware [Member] |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |
Total stock-based compensation | 3 | 3 | 6 | 6
Services [Member] |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |
Total stock-based compensation | 14 | 14 | 26 | 28
Sales and marketing [Member] |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |
Total stock-based compensation | 80 | 37 | 151 | 125
Research and development [Member] |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |
Total stock-based compensation | 314 | 272 | 590 | 543
General and administrative [Member] |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |
Total stock-based compensation | $ 41 | $ 41 | $ 77 | $ 80

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