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Fair Value - Quantitative Information about Significant Unobservable Inputs Utilized by Company in Fair Value Measurements of Level 3 Assets (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fixed Maturity Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Credit spread adjustment 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember		 4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
Fixed Maturity Securities [Member] | Discounted Cash Flow [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assets 101us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= l_DiscountedCashFlowMember		 142us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= l_DiscountedCashFlowMember
Valuation Techniques Discounted cash flow  
Fixed Maturity Securities [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Credit spread adjustment 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Fixed Maturity Securities [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Credit spread adjustment 13.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 20.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_FixedIncomeSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Equity Securities [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Private offering price 600l_FairValueUnobservableInputsWeightedAveragePrivateOfferingPrice
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember		 1,148l_FairValueUnobservableInputsWeightedAveragePrivateOfferingPrice
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
Equity Securities [Member] | Market approach [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assets 16us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= l_MarketApproachMember		 10us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= l_MarketApproachMember
Valuation Techniques Market approach  
Equity Securities [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Private offering price 12l_FairValueUnobservableInputsWeightedAveragePrivateOfferingPrice
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 360l_FairValueUnobservableInputsWeightedAveragePrivateOfferingPrice
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Equity Securities [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Private offering price 4,391l_FairValueUnobservableInputsWeightedAveragePrivateOfferingPrice
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 4,268l_FairValueUnobservableInputsWeightedAveragePrivateOfferingPrice
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Life Settlement Contracts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Discount rate risk premium 9.00%l_FairValueUnobservableInputsDiscountRateRiskPremium
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember		 9.00%l_FairValueUnobservableInputsDiscountRateRiskPremium
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember
Mortality assumption 163.00%l_FairValueUnobservableInputsMortalityAssumption
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember		 192.00%l_FairValueUnobservableInputsMortalityAssumption
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember
Life Settlement Contracts [Member] | Discounted Cash Flow [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair Value Assets 82us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= l_DiscountedCashFlowMember		 88us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= l_DiscountedCashFlowMember
Valuation Techniques Discounted cash flow  
Life Settlement Contracts [Member] | Minimum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortality assumption 55.00%l_FairValueUnobservableInputsMortalityAssumption
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 70.00%l_FairValueUnobservableInputsMortalityAssumption
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Life Settlement Contracts [Member] | Maximum [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Mortality assumption 1676.00%l_FairValueUnobservableInputsMortalityAssumption
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 743.00%l_FairValueUnobservableInputsMortalityAssumption
/ us-gaap_FairValueByAssetClassAxis
= l_LifeSettlementContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember