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STOCKHOLDERS' EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	Mar. 17, 2015	Sep. 18, 2014
Dividends on Common Stock [Abstract]
Dividends per share, declared and paid (in dollars per share)	$ 0.12	$ 0.12	$ 0.36	$ 0.36
Dividends declared per share of outstanding common stock (in dollars per share)					$ 0.15us-gaap_DividendsPayableAmountPerShare
Increase in dividends declared per share of outstanding common stock over prior period (in dollars per share)					$ 0.03
Dividend payable date			Apr. 28, 2015
Dividend record date			Apr. 07, 2015
Stock Repurchases (Narrative) [Abstract]
Approved expansion of stock repurchase program						$ 13,000
Amount available for future repurchases	11,200		11,200
Repurchases of common stock (in shares)			147,700,000	231,400,000
Repurchased amount			6,100	7,800
Repurchased shares that were not settled (in shares)			2,300,000
Repurchased amount that was not settled			102orcl_RepurchasedAmountThatWasNotSettled
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	234us-gaap_ShareBasedCompensation	198us-gaap_ShareBasedCompensation	689us-gaap_ShareBasedCompensation	583us-gaap_ShareBasedCompensation
Stock options granted and assumed (in shares)			36,000,000
Restricted stock-based awards granted and assumed (in shares)			26,000,000
Forfeitures and cancellations (in shares)			15,000,000
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 8 months	4 years 8 months	5 years 1 month	5 years 1 month
Risk-free interest rate	1.30%	1.50%	1.70%	1.40%
Volatility	24.00%	24.00%	23.00%	27.00%
Dividend yield	1.10%	1.30%	1.20%	1.60%
Weighted-average fair value per share (in dollars per share)	$ 27.77	$ 7.18	$ 9.78	$ 6.65
Sales and marketing [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	45	40	131	118
Cloud software-as-a-service and platform-as-a-service [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	3	2	8	5
Cloud infrastructure-as-a-service [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1	1	3	2
Software license updates and product support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	6	6	15	16
Hardware systems products [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	1	1	4	4
Hardware systems support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	2	1	4	4
Services [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	8	6	23	18
Research and development [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	138	99	380	285
General and administrative [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	29	42	116	127
Acquisition related and other [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	$ 1		$ 5	$ 4
Performance-based restricted stock units [Member]
Stock-based Compensation Expense [Line Items]
Restricted stock-based awards granted and assumed (in shares)			3,000,000
Maximum percentage that can exceed target performance metric			150.00%