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v3.21.2

Segment Reporting (Narrative) (Details) | 6 Months Ended
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Jun. 30, 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