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Collateralized Reinsurance And Trust Agreements (Premiums And Losses Ceded By The Company To Affiliate) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Effects of Reinsurance [Line Items]
Ceded written premiums	$ 50,239	$ 99,110
Ceded earned premiums	50,443	78,107
Ceded losses and LAE	40,620	80,843
Assumed written premiums	793	2,476
Assumed earned premiums	793	2,476
Assumed losses and LAE

X

- Definition

Assumed earned premiums

+ References

No definition available.

+ Details

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Namespace Prefix:	re_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Assumed Losses And Loss Adjustment Expenses

+ References

No definition available.

+ Details

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- Definition

Ceded earned premiums

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Ceded Losses And Loss Adjustment Expenses

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Amount of written premiums assumed from other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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Balance Type:	credit
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X

- Definition

Amount of written premiums ceded to other entities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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Period Type:	duration

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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