DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
	May 31, 2019	Jun. 17, 2019	Nov. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	May 31, 2019
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Trading Symbol	ORCL
Entity Registrant Name	Oracle Corporation
Entity Central Index Key	0001341439
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Address, State or Province	California
Current Fiscal Year End Date	--05-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		3,335,819,000
Entity Public Float (in dollars)			$ 107,968,269,000