XML 82 R70.htm IDEA: XBRL DOCUMENT
v3.21.1

Segment Reporting (Narrative) (Details) | 3 Months Ended
--- | ---
Mar. 31, 2021
Segment Reporting [Abstract] |
Percentage threshold of Company revenue not exceeded by any other country | 5.00%

X
- References No definition available. + Details
Name: | re_PercentageThresholdOfCompanyRevenueNotExceededByAnyOtherCountry
Namespace Prefix: | re_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration