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STOCKHOLDERS' EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013	Dec. 17, 2014	Sep. 18, 2014
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)	$ 0.12	$ 0.12	$ 0.24	$ 0.24
Dividends declared per share of outstanding common stock (in dollars per share)					$ 0.12us-gaap_DividendsPayableAmountPerShare
Dividend payable date			Jan. 28, 2015
Dividend record date			Jan. 07, 2015
Stock Repurchases (Narrative) [Abstract]
Approved expansion of stock repurchase program						$ 13,000
Amount available for future repurchases	13,200		13,200
Repurchases of common stock (in shares)			101,600,000	176,100,000
Repurchased amount			4,100	5,800
Repurchased shares that were not settled (in shares)			2,300,000
Repurchased amount that was not settled			95orcl_RepurchasedAmountThatWasNotSettled
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	241us-gaap_ShareBasedCompensation	183us-gaap_ShareBasedCompensation	455us-gaap_ShareBasedCompensation	382us-gaap_ShareBasedCompensation
Stock options granted and assumed (in shares)			35,000,000
Restricted stock-based awards granted (in shares)			24,000,000
Forfeitures and cancellations (in shares)			12,000,000
Equivalent number of shares deducted against share pool (in actual number of shares)			2.5
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract]
Expected life (in years)	4 years 11 months	4 years 8 months	5 years 1 month	5 years 1 month
Risk-free interest rate	1.70%	1.30%	1.70%	1.40%
Volatility	23.00%	24.00%	23.00%	27.00%
Dividend yield	1.20%	1.50%	1.20%	1.60%
Weighted-average fair value per share (in dollars per share)	$ 10.94	$ 6.28	$ 8.97	$ 6.62
Sales and marketing [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	43	37	86	77
Cloud software-as-a-service and platform-as-a-service [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	3	2	5	4
Cloud infrastructure-as-a-service [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1	1	2	2
Software license updates and product support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	4	5	9	11
Hardware systems products [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1	1	3	3
Hardware systems support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	2	1	3	3
Services [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	9	6	14	11
Research and development [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	134	87	242	184
General and administrative [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	43	42	87	83
Acquisition related and other [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	$ 1	$ 1	$ 4	$ 4
Performance-based restricted stock units [Member]
Stock-based Compensation Expense [Line Items]
Restricted stock-based awards granted (in shares)			3,000,000
Maximum percentage that can exceed target performance metric			150.00%