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Reserve For Losses, LAE And Future Policy Benefit Reserve (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year losses	$ 1,790,798	$ 1,713,253
Catastrophe Losses [Member]
Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]
Current year losses	$ 155,000

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- Definition

Reserve For Losses LAE And Future Policy Benefit Reserve [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	re_
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- Definition

Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437

+ Details

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Balance Type:	debit
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- Details

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