DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
	Aug. 31, 2019	Sep. 10, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Aug. 31, 2019
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2020
Entity Registrant Name	Oracle Corporation
Entity Central Index Key	0001341439
Current Fiscal Year End Date	--05-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		3,288,330,000
Entity File Number	001-35992
Entity Tax Identification Number	54-2185193
Entity Address Postal Zip Code	94065
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Address, Address Line One	500 Oracle Parkway
Entity Address, City or Town	Redwood City
Entity Address State Or Province	CA
City Area Code	650
Local Phone Number	506-7000
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	ORCL
Security Exchange Name	NYSE
2.25% senior notes due January 2021
Document Information [Line Items]
Title of 12(b) Security	2.25% senior notes due January 2021
Trading Symbol	0
Security Exchange Name	NYSE
3.125% senior notes due July 2025
Document Information [Line Items]
Title of 12(b) Security	3.125% senior notes due July 2025
Trading Symbol	0
Security Exchange Name	NYSE