| Document and Entity Information Document | Aug. 10, 2020 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Aug. 10, 2020 |
| Entity Registrant Name | AVAYA HOLDINGS CORP. |
| Entity Central Index Key | 0001418100 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38289 |
| Entity Tax Identification Number | 26-1119726 |
| Entity Address, Address Line One | 4655 Great America Parkway |
| Entity Address, City or Town | Santa Clara, |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 95054 |
| City Area Code | 908 |
| Local Phone Number | 953-6000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | AVYA |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
