Deferred Charge Assets (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
DCA
Beginning carrying value	$ 745	$ 731
Recorded during the period	4	0
Amortization	(30)	(30)
Ending carrying value	$ 719	$ 701

The remaining unamortized excess of the estimated ultimate liability for claims and claim costs over the premiums earned with respect to retroactive reinsurance contracts.

No definition available.

Name:	esgr_UnamortizedDeferredChargeAssetsOnReinsuranceAssumed
Namespace Prefix:	esgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant