| Document and Entity Information | Aug. 04, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001527508 |
| Document Type | 8-K |
| Document Period End Date | Aug. 4, 2021 |
| Entity Registrant Name | Pactiv Evergreen Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39528 |
| Entity Tax Identification Number | 98-1538656 |
| Entity Address, Address Line One | 1900 W. Field Court |
| Entity Address, City or Town | Lake Forest |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60045 |
| City Area Code | 847 |
| Local Phone Number | 482-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock, par value $0.001 per share |
| Trading Symbol | PTVE |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
