| Document And Entity Information | Oct. 22, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Oct. 22, 2020 |
| Entity File Number | 1-15731 |
| Entity Registrant Name | Everest Re Group, Ltd. |
| Entity Central Index Key | 0001095073 |
| Entity Incorporation State Country Code | D0 |
| Entity Tax Identification Number | 98-0365432 |
| Entity Address Address Line 1 | Seon Place – 4th Floor |
| Entity Address Address Line 2 | 141 Front Street |
| Entity Address Address Line 3 | PO Box HM 845 |
| Entity Address City Or Town | Hamilton |
| Entity Address Postal Zip Code | HM 19 |
| Entity Address Country | BM |
| City Area Code | 441 |
| Local Phone Number | 295-0006 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Security 12b Title | Common Shares, $0.01 par value |
| Trading Symbol | RE |
| Security Exchange Name | NYSE |
