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Future Policy Benefit Reserve (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
May 30, 2014
Future policy benefit reserves are comprised of the following:      
Traditional life $ 789,133us-gaap_LiabilityForFuturePolicyBenefitsLife $ 827,341us-gaap_LiabilityForFuturePolicyBenefitsLife  
Annuities 3,918,066us-gaap_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuitiesAndSupplementaryContracts 3,976,475us-gaap_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuitiesAndSupplementaryContracts  
Total future policy benefit reserves 4,707,199us-gaap_LiabilityForFuturePolicyBenefits 4,803,816us-gaap_LiabilityForFuturePolicyBenefits  
Other information:      
Average interest rate used for future policy benefits, percent 3.30%xlgroup_LiabilityForFuturePolicyBenefitsInterestRateAssumptionPercentage 4.40%xlgroup_LiabilityForFuturePolicyBenefitsInterestRateAssumptionPercentage  
XL Re Life (SAC) Ltd [Member]      
Liability for Future Policy Benefit, by Product Segment [Line Items]      
Future Policy Benefit Reserves Recoverable $ 4,265,678xlgroup_FuturePolicyBenefitReservesRecoverable
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= xlgroup_XLReLifeSACLtdMember		   $ 4,800,000xlgroup_FuturePolicyBenefitReservesRecoverable
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= xlgroup_XLReLifeSACLtdMember