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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
May 31, 2016 | May 31, 2015 | May 31, 2014
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Defined contribution plan expense |  | $ 387 |  | $ 362 | $ 357
Deferred compensation plan assets |  | 419 |  | 408 |
Deferred compensation plan liabilities |  | 419 |  | 408 |
Total defined benefit plan pension expense |  | 95 |  | 69 | $ 64
Aggregate projected benefit obligation |  | 949 |  | 1,000 |
Aggregate net liability (funded status) |  | $ 587 |  | $ 599 |
Employee Stock Purchase Plan [Line Items] |  |  |  |  |
Common stock issued under stock purchase plans |  | 3 |  | 3 | 3
Nonvested Awards Compensation Cost Not Yet Recognized [Line Items] |  |  |  |  |
Unrecognized compensation expense for shares expected to vest |  | $ 474 |  |  |
Unrecognized compensation expense related to non-vested restricted stock-based awards |  | $ 1,300 |  |  |
Weighted average recognition period of unrecognized compensation expense for shares expected to vest |  | 2 years 7 days |  |  |
Shares Under Option [Abstract] |  |  |  |  |
Beginning balance |  | 413 |  | 462 | 447
Granted |  | 25 | [1] | 34 | 131
Assumed |  | 1 |  | 3 | 5
Exercised |  | (53) |  | (70) | (95)
Canceled |  | (11) |  | (16) | (26)
Ending balance |  | 375 |  | 413 | 462
Vested |  | 253 |  |  |
Expected to vest | [2] | 115 |  |  |
Total |  | 368 |  |  |
Shares not expected to vest |  | 7 |  |  |
Weighted Average Exercise Price [Abstract] |  |  |  |  |
Beginning balance |  | $ 28.64 |  | $ 27.37 | $ 25.48
Granted |  | 40.34 | [1] | 40.54 | 31.02
Assumed |  | 4.97 |  | 21.98 | 9.02
Exercised |  | 25.13 |  | 24.49 | 21.51
Canceled |  | 35.19 |  | 33.76 | 30.60
Ending balance |  | 29.66 |  | $ 28.64 | $ 27.37
Vested |  | 27.52 |  |  |
Expected to vest | [2] | 33.91 |  |  |
Total |  | $ 29.52 |  |  |
Weighted Average Remaining Contract Term (in years) |  |  |  |  |
Vested |  | 4 years 10 months 3 days |  |  |
Expected to vest | [2] | 7 years 2 months 13 days |  |  |
Total |  | 5 years 6 months 28 days |  |  |
In-the-Money Options as of May 31, 2016 (in millions) |  |  |  |  |
Vested |  | 245 |  |  |
Expected to vest | [2] | 76 |  |  |
Total |  | 321 |  |  |
Aggregate Intrinsic Value (in millions) |  |  |  |  |
Vested | [3] | $ 3,232 |  |  |
Expected to vest | [2],[3] | 736 |  |  |
Total | [3] | $ 3,968 |  |  |
Closing stock price |  | $ 40.20 |  |  |
Shares Under Restricted Stock-based Awards [Abstract] |  |  |  |  |
Beginning balance |  | 28 |  | 1 |
Granted |  | 34 |  | 28 |
Vested |  | (7) |  |  |
Cancelled |  | (3) |  | (1) |
Ending balance |  | 52 |  | 28 | 1
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Beginning balance |  | $ 40.63 |  | $ 35.29 |
Granted |  | 38.50 |  | 40.73 |
Vested |  | 40.39 |  |  |
Cancelled |  | 39.73 |  | 39.52 |
Ending balance |  | $ 39.29 |  | $ 40.63 | $ 35.29
Total grant date fair value of restricted stock-based awards, vested |  | $ 261 |  | $ 28 |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 1,037 |  | 933 | $ 805
Estimated income tax benefit included in provision for income taxes |  | (322) |  | (294) | (260)
Total stock-based compensation, net of estimated income tax benefit |  | 715 |  | 639 | 545
Tax Benefits from Exercise of Stock Options and Vesting of Restricted Stock-Based Awards [Abstract] |  |  |  |  |
Total cash received as a result of option exercises |  | 1,300 |  | 1,700 | 2,000
Aggregate intrinsic value of vesting of restricted stock-based awards and options exercised |  | 1,000 |  | 1,300 | 1,500
Tax benefits realized in connection with the vesting of restricted stock-based awards and exercises of stock options |  | 311 |  | 396 | 480
Excess tax benefits on the exercise of stock options and vesting of restricted stock-based awards |  | $ 124 |  | $ 244 | $ 250
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract] |  |  |  |  |
Expected life (in years) |  | 4 years 9 months 22 days |  | 5 years 1 month 7 days | 4 years 10 months 29 days
Risk-free interest rate |  | 1.60% |  | 1.70% | 1.30%
Volatility |  | 24.00% |  | 23.00% | 27.00%
Dividend yield |  | 1.50% |  | 1.20% | 1.50%
Weighted-average fair value per share |  | $ 8.49 |  | $ 9.62 | $ 7.47
Sales and marketing [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | $ 220 |  | $ 180 | $ 165
Cloud software as a service and platform as a service [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 17 |  | 10 | 8
Cloud infrastructure as a service [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 4 |  | 5 | 4
Software license updates and product support [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 23 |  | 21 | 22
Hardware products [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 7 |  | 6 | 5
Hardware support [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 5 |  | 6 | 6
Services |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 29 |  | 30 | 29
Research and development [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 609 |  | 522 | 385
General and administrative [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | 120 |  | 148 | 171
Acquisition related and other [Member] |  |  |  |  |
Stock-based Compensation Expense [Line Items] |  |  |  |  |
Total stock-based compensation |  | $ 3 |  | 5 | 10
Employee Stock Purchase Plan [Member] |  |  |  |  |
Employee Stock Purchase Plan [Line Items] |  |  |  |  |
Stock purchase price as a percentage of the fair market value on the purchase date |  | 95.00% |  |  |
Shares reserved for future issuances under the Purchase Plan |  | 54 |  |  |
United States [Member] |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Oracle 401(K) Plan employee contribution maximum rate |  | 40.00% |  |  |
Oracle 401 (K) employer contribution match rate |  | 50.00% |  |  |
Oracle 401(K) employer maximum match on employee contribution each pay period |  | 6.00% |  |  |
Defined contribution plan expense |  | $ 153 |  | $ 144 | $ 134
Restricted Stock Units [Member] |  |  |  |  |
Nonvested Awards Compensation Cost Not Yet Recognized [Line Items] |  |  |  |  |
Weighted average recognition period of unrecognized compensation expense for shares expected to vest |  | 2 years 10 months 21 days |  |  |
[1] | Approximately 7 million of the 25 million stock options granted during fiscal 2016 were to our Chief Executive Officers and Chief Technology Officer and had contractual lives of five years versus the 10-year contractual lives for the other stock options granted.
[2] | 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, 2016 was approximately $474 million and is expected to be recognized over a weighted-average period of 2.02 years. Approximately 7 million shares outstanding as of May 31, 2016 were not expected to vest.
[3] | The aggregate intrinsic value was calculated based on the gross difference between our closing stock price on the last trading day of fiscal 2016 of $40.20 and the exercise prices for all 'in-the-money' options outstanding, excluding tax effects.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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