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Derivative Instruments (Foreign Exchange Contracts - Cash Flow Hedging Disclosure) (Details)
 3 Months Ended 3 Months Ended
May 02, 2015
USD ($)
Jan. 31, 2015
USD ($)
May 03, 2014
USD ($)
May 02, 2015
Other Comprehensive Income (Loss) [Member]
USD ($)
May 03, 2014
Other Comprehensive Income (Loss) [Member]
USD ($)
May 02, 2015
Other Income (Loss) [Member]
USD ($)
May 03, 2014
Other Income (Loss) [Member]
USD ($)
Jan. 31, 2015
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
USD ($)
Jan. 31, 2015
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
CAD
Jan. 31, 2007
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
CAD
Foreign Currency Cash Flow Hedge Liability at Fair Value     $ 21,000,000us-gaap_ForeignCurrencyCashFlowHedgeLiabilityAtFairValue              
Derivative, Notional Amount                 200,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 470,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
Gain (loss) on foreign currency cash flow hedge discontinuance               4,000,000lb_Gainlossonforeigncurrencycashflowhedgediscontinuance
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		    
Foreign Currency Gain (Loss)               6,000,000lb_ForeignCurrencyGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax       (10,000,000)us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherComprehensiveIncomeMember		 (8,000,000)us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherComprehensiveIncomeMember		          
(Gain) Loss Reclassified from Accumulated Other Comprehensive Income (Loss) into Other Income (Loss)           17,000,000us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1] 6,000,000us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1]      
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness 0us-gaap_GainLossOnForeignCurrencyCashFlowHedgeIneffectiveness                  
Foreign Currency Cash Flow Hedge Asset at Fair Value $ 11,000,000us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue $ 21,000,000us-gaap_ForeignCurrencyCashFlowHedgeAssetAtFairValue                
[1] Represents reclassification of amounts from accumulated other comprehensive income to earnings to completely offset foreign currency transaction gains and losses recognized on the intercompany loans. No ineffectiveness was associated with these foreign exchange cash flow hedges