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Derivative Instruments Derivative Instruments (Foreign Exchange Contracts - Cash Flow Hedging Disclosure) (Details) | 12 Months Ended |  |
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Jan. 31, 2015 USD ($) | Jan. 31, 2015 Other Comprehensive Income (Loss) [Member] USD ($) | Feb. 01, 2014 Other Comprehensive Income (Loss) [Member] USD ($) | Jan. 31, 2015 Other Income [Member] USD ($) | Feb. 01, 2014 Other Income [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
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | 200,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_CashFlowHedgingMember | 470,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_CashFlowHedgingMember
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax |  | 34,000,000 us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember | 46,000,000 us-gaap_UnrealizedGainLossOnForeignCurrencyDerivativesNetBeforeTax / us-gaap_OtherComprehensiveIncomeLocationAxis = us-gaap_OtherComprehensiveIncomeMember |  |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net |  |  |  | 60,000,000 us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | [1] | 50,000,000 us-gaap_ForeignCurrencyCashFlowHedgeGainLossReclassifiedToEarningsNet / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherIncomeMember | [1] |  |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness | 0 us-gaap_GainLossOnForeignCurrencyCashFlowHedgeIneffectiveness |  |  |  |  |  |  |  |  |
Gain (loss) on foreign currency cash flow hedge discontinuance |  |  |  |  |  |  |  | 4,000,000 lb_Gainlossonforeigncurrencycashflowhedgediscontinuance / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_CashFlowHedgingMember |  |
Foreign Currency Gain (Loss) |  |  |  |  |  |  |  | $ 6,000,000 lb_ForeignCurrencyGainLoss / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_CashFlowHedgingMember |  |
[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.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Foreign Currency Gain (Loss) + References No definition available. + Details
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- Definition Gain (loss) on foreign currency cash flow hedge discontinuance + References No definition available. + Details
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- Details
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- Definition The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition The net gain (loss) during the reporting period due to ineffectiveness in foreign currency cash flow hedges. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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