| Document and Entity Information | Mar. 30, 2020 |
| Document And Entity Information [Line Items] | |
| Entity Registrant Name | ORACLE CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0001341439 |
| Document Type | 8-K |
| Document Period End Date | Mar. 30, 2020 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-35992 |
| Entity Tax Identification Number | 54-2185193 |
| Entity Address, Address Line One | 500 Oracle Parkway |
| Entity Address, City or Town | Redwood City |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94065 |
| City Area Code | (650) |
| Local Phone Number | 506-7000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | ORCL |
| Security Exchange Name | NYSE |
| Senior Notes Due January 2021 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 2.25% senior notes due January 2021 |
| Trading Symbol | ORCL |
| Security Exchange Name | NYSE |
| Senior Notes Due July 2025 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.125% senior notes due July 2025 |
| Trading Symbol | ORCL |
| Security Exchange Name | NYSE |
