| Document and Entity Information | Jun. 16, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | Seagate Technology plc |
| Amendment Flag | false |
| Entity Central Index Key | 0001137789 |
| Document Type | 8-K |
| Document Period End Date | Jun. 16, 2020 |
| Entity Incorporation State Country Code | L2 |
| Entity File Number | 001-31560 |
| Entity Tax Identification Number | 98-0648577 |
| Entity Address, Address Line One | 38/39 Fitzwilliam Square |
| Entity Address, City or Town | Dublin 2 |
| Entity Address, Country | IE |
| Entity Address, Postal Zip Code | D02 NX53 |
| City Area Code | (353) (1) |
| Local Phone Number | 234-3136 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Ordinary Shares, par value $0.00001 per share |
| Trading Symbol | STX |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
