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STOCKHOLDERS' EQUITY Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 18, 2019 | May 31, 2019 | May 31, 2018 | May 31, 2017
Stock Repurchases [Abstract] |  |  |  |
Approved expansion of stock repurchase program |  | $ 24,000 |  |
Amount available for future repurchases |  |  |  | $ 5,800
Repurchases of common stock (in shares) |  | 733.8 | 238.0 | 85.6
Repurchased amount |  | $ 36,000 | $ 11,503 | $ 3,492
Repurchased shares that were not settled (in shares) |  | 0.8 |  |
Repurchased amount that was not settled |  | $ 40 |  |
Dividends on Common Stock [Abstract] |  |  |  |
Dividends per share, declared and paid (in dollars per share) |  | $ 0.81 | $ 0.76 | $ 0.64
Subsequent Event [Member] |  |  |  |
Dividends on Common Stock [Abstract] |  |  |  |
Dividends declared per share of outstanding common stock (in dollars per share) | $ 0.24 |  |  |
Dividend payable date | Jul. 31, 2019 |  |  |
Dividend record date | Jul. 17, 2019 |  |  |

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