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Segment Reporting (Narrative) (Details)	9 Months Ended
	Sep. 30, 2021
Segment Reporting [Abstract]
Percentage threshold of Company revenue not exceeded by any other country	5.00%

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- References

No definition available.

+ Details

Name:	re_PercentageThresholdOfCompanyRevenueNotExceededByAnyOtherCountry
Namespace Prefix:	re_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

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Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration