EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	May 31, 2013		May 31, 2012	May 31, 2011
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	$ 353		$ 344	$ 312
Deferred compensation plan assets	320		264
Deferred compensation plan liabilities	320		264
Total defined benefit plan pension expense	81		55	76
Aggregate projected benefit obligation	734		691
Aggregate net liability (funded status)	364		297
Employee Stock Purchase Plan [Line Items]
Common stock issued under stock purchase plans	3		4	4
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	755		659	510
Estimated income tax benefit included in provision for income taxes	(243)		(216)	(170)
Total stock-based compensation, net of estimated income tax benefit	512		443	340
Shares Under Option [Abstract]
Beginning balance	422		354	352
Granted	119		112	110
Assumed	9		8	1
Exercised	(83)		(39)	(78)
Canceled	(20)		(13)	(31)
Ending balance	447		422	354
Vested	193
Expected to vest	228	[1]
Total	421
Weighted Average Exercise Price [Abstract]
Beginning balance	$ 22.66		$ 19.53	$ 18.84
Granted	$ 29.90		$ 32.05	$ 22.58
Assumed	$ 32.52		$ 12.17	$ 16.38
Exercised	$ 17.38		$ 16.61	$ 16.73
Canceled	$ 28.94		$ 29.31	$ 29.17
Ending balance	$ 25.48		$ 22.66	$ 19.53
Vested	$ 21.17
Expected to vest	$ 28.60	[1]
Total	$ 25.20
Weighted Average Remaining Contractual Term (in years)
Vested	5 years 2 months
Expected to vest	8 years 2 months	[1]
Total	6 years 10 months
In-the-Money Options as of May 31, 2013 (in millions)
Vested	189
Expected to vest	224	[1]
Total	413
Aggregate Intrinsic Value (in millions)
Vested	2,491	[2]
Expected to vest	1,215	[1],[2]
Total	3,706	[2]
Closing stock price	$ 33.78
Unrecognized compensation expense for shares expected to vest	1,200
Weighted average recognition period of unrecognized compensation expense for shares expected to vest	2 years 7 months
Shares not expected to vest	26
Tax Benefits from Exercise of Stock Options and Vesting of Restricted Stock-Based Awards [Abstract]
Total cash received as a result of option exercises	1,400		622	1,300
Aggregate intrinsic value of options exercised and vesting of restricted stock-based awards	1,300		587	1,100
Tax benefits realized in connection with the exercises of stock options and vesting of restricted stock-based awards	410		182	325
Excess tax benefits on the exercise of stock options and vesting of restricted stock-based awards	241		97	215
Weighted Average Input Assumptions Used and Resulting Fair Values [Abstract]
Expected life (in years)	5 years 0 months		5 years 1 month	5 years 1 month
Risk-free interest rate	0.70%		1.60%	1.80%
Volatility	31.00%		30.00%	33.00%
Dividend yield	0.80%		0.80%	0.90%
Weighted-average fair value per share	$ 7.99		$ 9.30	$ 6.61
Sales and marketing [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	147		122	87
Software license updates and product support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	20		18	14
Hardware systems products [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	3		1	2
Hardware systems support [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	5		5	5
Services [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	31		23	16
Research and development [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	352		295	231
General and administrative [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	164		162	145
Acquisition related and other [Member]
Stock-based Compensation Expense [Line Items]
Total stock-based compensation	33		33	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	64
United States [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan expense	$ 129		$ 125	$ 119
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%

[1] 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, 2013 was approximately $1.2 billion and is expected to be recognized over a weighted average period of 2.57 years. Approximately 26 million shares outstanding as of May 31, 2013 were not expected to vest.

[2] The aggregate intrinsic value was calculated based on the gross difference between our closing stock price on the last trading day of fiscal 2013 of $33.78 and the exercise prices for all "in-the-money" options outstanding, excluding tax effects.