Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Aug. 01, 2021
Document And Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Fiscal Year Focus	2021
Document Transition Report	false
Entity File Number	1-14527
Entity Registrant Name	EVEREST REINSURANCE HOLDINGS INC
Entity Incorporation State Country Code	DE
Entity Tax Identification Number	22-3263609
Entity Address Address Line 1	100 Everest Way
Entity Address City Or Town	Warren
Entity Address, State or Province	NJ
Entity Address Postal Zip Code	07059
City Area Code	908
Local Phone Number	604-3000
Title of 12(b) Security	Common Shares, $0.01 par value
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,000
Amendment Flag	false
Entity Central Index Key	0000914748
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31