| Document and Entity Information | Oct. 22, 2019 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001601046 |
| Document Type | 8-K |
| Document Period End Date | Oct. 22, 2019 |
| Entity Registrant Name | KEYSIGHT TECHNOLOGIES, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36334 |
| Entity Tax Identification Number | 46-4254555 |
| Entity Address, Address Line One | 1400 Fountaingrove Parkway |
| Entity Address, City or Town | Santa Rosa |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95403 |
| City Area Code | (800) |
| Local Phone Number | 829-4444 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.01 per share |
| Trading Symbol | KEYS |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
