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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
May 31, 2019 | May 31, 2018 | May 31, 2017
Shares Under Restricted Stock-based Awards [Abstract] |  |  |  |  |  |  |
Beginning balance |  | 89 |  | 83 |  | 52 |
Granted |  | 53 |  | 44 |  | 42 |
Assumed |  |  |  |  |  | 14 |
Vested and Issued |  | (31) |  | (27) |  | (18) |
Canceled |  | (12) |  | (11) |  | (7) |
Ending balance |  | 99 |  | 89 |  | 83 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |
Total grant date fair value of restricted stock-based awards, vested and issued |  | $ 1,300 |  | $ 1,000 |  | $ 715 |
Beginning balance |  | $ 42.93 |  | $ 39.18 |  | $ 39.29 |
Granted |  | 42.47 |  | 47.42 |  | 39.40 |
Assumed |  |  |  |  |  | 37.83 |
Vested and Issued |  | 41.85 |  | 39.10 |  | 40.39 |
Canceled |  | 42.97 |  | 41.97 |  | 39.73 |
Ending balance |  | $ 43.01 |  | $ 42.93 |  | $ 39.18 |
Unrecognized compensation expense related to non-vested restricted stock-based awards |  | $ 2,800 |  |  |  |  |
Shares Under Stock Option [Abstract] |  |  |  |  |  |  |
Beginning balance |  | 304 |  | 312 |  | 375 |
Granted |  | 7 | [1] | 77 | [2] | 18 | [2]
Assumed |  |  |  |  |  | 2 |
Exercised |  | (72) |  | (78) |  | (77) |
Canceled |  | (17) |  | (7) |  | (6) |
Ending balance |  | 222 |  | 304 |  | 312 |
Vested |  | 146 |  |  |  |  |
Expected to vest | [3] | 42 |  |  |  |  |
Total |  | 188 |  |  |  |  |
Weighted Average Exercise Price [Abstract] |  |  |  |  |  |  |
Beginning balance |  | $ 36.11 |  | $ 29.02 |  | $ 29.66 |
Granted |  | 43.47 | [1] | 50.95 | [2] | 40.90 | [2]
Assumed |  |  |  |  |  | 13.06 |
Exercised |  | 28.32 |  | 28.78 |  | 26.65 |
Canceled |  | 49.28 |  | 45.70 |  | 36.28 |
Ending balance |  | 37.78 |  | $ 36.11 |  | $ 29.02 |
Vested |  | 32.13 |  |  |  |  |
Expected to vest | [3] | 46.95 |  |  |  |  |
Total |  | $ 35.45 |  |  |  |  |
Weighted Average Remaining Contract Term (in years) [Abstract] |  |  |  |  |  |  |
Vested |  | 3 years 3 months 25 days |  |  |  |  |
Expected to vest | [3] | 6 years 5 months 19 days |  |  |  |  |
Total |  | 4 years 7 days |  |  |  |  |
Aggregate Intrinsic Value (in millions) [Abstract] |  |  |  |  |  |  |
Vested | [4] | $ 2,698 |  |  |  |  |
Expected to vest | [3],[4] | 181 |  |  |  |  |
Total | [4] | $ 2,879 |  |  |  |  |
Closing stock price |  | $ 50.60 |  |  |  |  |
Unrecognized compensation expense for shares expected to vest |  | $ 254 |  |  |  |  |
Shares not expected to vest |  | 34 |  |  |  |  |
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract] |  |  |  |  |  |  |
Expected life (in years) |  | 4 years 7 months 6 days |  | 4 years 8 months 12 days |  | 4 years 9 months 18 days |
Risk-free interest rate |  | 2.70% |  | 2.00% |  | 1.00% |
Volatility |  | 24.00% |  | 22.00% |  | 23.00% |
Dividend yield |  | 1.70% |  | 1.50% |  | 1.50% |
Weighted-average fair value per share |  | $ 10.77 |  | $ 9.34 |  | $ 8.18 |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total stock-based compensation |  | $ 1,653 |  | $ 1,607 |  | $ 1,350 |
Estimated income tax benefit included in provision for income taxes |  | (358) |  | (451) |  | (423) |
Total stock-based compensation, net of estimated income tax benefit |  | $ 1,295 |  | $ 1,156 |  | $ 927 |
Common stock issued under stock purchase plans |  | 2 |  | 3 |  | 3 |
Other Postretirement Plans [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total defined benefit plan pension expense |  | $ 90 |  | $ 102 |  | $ 85 |
Aggregate projected benefit obligation |  | 1,200 |  | 1,100 |  |  |
Aggregate net liability (funded status) |  | $ 821 |  | $ 711 |  |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Stock purchase price as a percentage of the fair market value on the purchase date |  | 95.00% |  |  |  |  |
Shares of common stock available for future awards |  | 46 |  |  |  |  |
Common stock issued under stock purchase plans |  | 2 |  | 3 |  | 3 |
Cloud services and license support [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total stock-based compensation |  | $ 99 |  | $ 82 |  | $ 54 |
Hardware [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total stock-based compensation |  | 10 |  | 10 |  | 11 |
Services [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total stock-based compensation |  | 49 |  | 52 |  | 44 |
Sales and marketing [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total stock-based compensation |  | 360 |  | 361 |  | 306 |
Research and development [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total stock-based compensation |  | 963 |  | 921 |  | 770 |
General and administrative [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total stock-based compensation |  | 172 |  | 180 |  | 130 |
Acquisition related and other [Member] |  |  |  |  |  |  |
Stock-based compensation expense and valuations of stock awards [Abstract] |  |  |  |  |  |  |
Total stock-based compensation |  | $ 0 |  | $ 1 |  | $ 35 |
Restricted Stock Units [Member] |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |
Weighted average recognition period of unrecognized compensation expense for shares expected to vest |  | 2 years 8 months 4 days |  |  |  |  |
Employee Stock Options [Member] |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |
Weighted average recognition period of unrecognized compensation expense for shares expected to vest |  | 2 years 8 months 26 days |  |  |  |  |
Performance-based stock options [Member] |  |  |  |  |  |  |
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract] |  |  |  |  |  |  |
Expected life (in years) |  |  |  | 7 years |  |  |
Risk-free interest rate |  |  |  | 2.14% |  |  |
Volatility |  |  |  | 22.44% |  |  |
Dividend yield |  |  |  | 1.49% |  |  |
Weighted-average fair value per share |  |  |  | $ 10 |  |  |
[1] | Awards granted in fiscal 2018 included 66.5 million PSOs granted in total to our Chief Executive Officers, Chief Technology Officer, and former President, Product Development, the contractual terms of which are described in greater detail above.
[2] | 6.75 million SOs were granted in total during fiscal 2017 to our Chief Executive Officers and Chief Technology Officer and have contractual lives of five years versus the ten-year contractual lives for most of the other SOs granted.
[3] | The unrecognized compensation expense calculated under the fair value method for shares expected to vest (unvested shares net of expected forfeitures) as of May 31, 2019 was approximately $254 million and is expected to be recognized over a weighted-average period of 2.74 years. Approximately 34 million shares outstanding as of May 31, 2019 were not expected to vest.
[4] | The aggregate intrinsic value was calculated based on the gross difference between our closing stock price on the last trading day of fiscal 2019 of $50.60 and the exercise prices for all “in-the-money” options outstanding, excluding tax effects.

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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