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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income (loss) attributable to ordinary shareholders $ 188,340us-gaap_NetIncomeLoss $ 1,059,916us-gaap_NetIncomeLoss $ 651,128us-gaap_NetIncomeLoss
Unrealized gains on held to maturity investment portfolio at time of transfer to available for sale, net of tax 424,861us-gaap_HeldToMaturitySecuritiesTransferredToAvailableForSaleSecuritiesUnrealizedGainLoss 0us-gaap_HeldToMaturitySecuritiesTransferredToAvailableForSaleSecuritiesUnrealizedGainLoss 0us-gaap_HeldToMaturitySecuritiesTransferredToAvailableForSaleSecuritiesUnrealizedGainLoss
Cumulative adjustments recorded to value of future policy benefit reserves, amount (400,456)xlgroup_OtherComprehensiveIncomeCumulativeAdjustmentShadowLiabilityFuturePolicyBenefitReserve (44,660)xlgroup_OtherComprehensiveIncomeCumulativeAdjustmentShadowLiabilityFuturePolicyBenefitReserve 0xlgroup_OtherComprehensiveIncomeCumulativeAdjustmentShadowLiabilityFuturePolicyBenefitReserve
Change in net unrealized gains (losses) on affiliate and other investments, net of tax 35,143xlgroup_ChangeInNetUnrealizedGainsLossesOnAffiliateAndOtherInvestmentsNetOfTax 26,637xlgroup_ChangeInNetUnrealizedGainsLossesOnAffiliateAndOtherInvestmentsNetOfTax 46,162xlgroup_ChangeInNetUnrealizedGainsLossesOnAffiliateAndOtherInvestmentsNetOfTax
Change in OTTI losses recognized in other comprehensive income, net of tax 13,143xlgroup_ChangeInOttiLossesRecognizedInOtherComprehensiveIncomeNetOfTax 32,181xlgroup_ChangeInOttiLossesRecognizedInOtherComprehensiveIncomeNetOfTax 67,280xlgroup_ChangeInOttiLossesRecognizedInOtherComprehensiveIncomeNetOfTax
Change in underfunded pension liability (7,550)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 7,653us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (3,371)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Change in value of cash flow hedge 255us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 439us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 439us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Foreign currency translation adjustments (25,729)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (54,858)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent (8,156)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Comprehensive income (loss) 936,141us-gaap_ComprehensiveIncomeNetOfTax 276,553us-gaap_ComprehensiveIncomeNetOfTax 1,588,083us-gaap_ComprehensiveIncomeNetOfTax
Exclude Life Funds Withheld Assets [Member]      
Change in net unrealized gains (losses) on investments, net of tax 434,051xlgroup_ChangeInNetUnrealizedGainsLossesOnInvestmentsNetOfTax
/ us-gaap_InvestmentTypeAxis
= xlgroup_ExcludeLifeFundsWithheldAssetsMember
(750,755)xlgroup_ChangeInNetUnrealizedGainsLossesOnInvestmentsNetOfTax
/ us-gaap_InvestmentTypeAxis
= xlgroup_ExcludeLifeFundsWithheldAssetsMember
834,601xlgroup_ChangeInNetUnrealizedGainsLossesOnInvestmentsNetOfTax
/ us-gaap_InvestmentTypeAxis
= xlgroup_ExcludeLifeFundsWithheldAssetsMember
Life Funds Withheld Assets [Member]      
Change in net unrealized gains (losses) on investments, net of tax $ 274,083xlgroup_ChangeInNetUnrealizedGainsLossesOnInvestmentsNetOfTax
/ us-gaap_InvestmentTypeAxis
= xlgroup_LifeFundsWithheldAssetsMember
$ 0xlgroup_ChangeInNetUnrealizedGainsLossesOnInvestmentsNetOfTax
/ us-gaap_InvestmentTypeAxis
= xlgroup_LifeFundsWithheldAssetsMember
$ 0xlgroup_ChangeInNetUnrealizedGainsLossesOnInvestmentsNetOfTax
/ us-gaap_InvestmentTypeAxis
= xlgroup_LifeFundsWithheldAssetsMember