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Funds Withheld on Life Retrocession Arrangements (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
May 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Funds withheld on life retrocession arrangements (net of future policy benefit reserves recoverable: 2014, $4,265,678; 2013, nil) $ 1,155,016xlgroup_FundsWithheldLiability $ 0xlgroup_FundsWithheldLiability  
XL Re Life (SAC) Ltd [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Assets held on a funds withheld basis relating to the Life Retro Arrangements 5,420,694xlgroup_AssetsFundsWithheld
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= xlgroup_XLReLifeSACLtdMember		    
Reinsurance recoverable from GCLR (4,265,678)xlgroup_FuturePolicyBenefitReservesRecoverable
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= xlgroup_XLReLifeSACLtdMember		   (4,800,000)xlgroup_FuturePolicyBenefitReservesRecoverable
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= xlgroup_XLReLifeSACLtdMember
Funds withheld on life retrocession arrangements (net of future policy benefit reserves recoverable: 2014, $4,265,678; 2013, nil) $ 1,155,016xlgroup_FundsWithheldLiability
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= xlgroup_XLReLifeSACLtdMember