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Derivative Instruments (Foreign Exchange Contracts - Cash Flow Hedging Disclosure) (Details) CAD in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2015 USD ($) | Nov. 01, 2014 USD ($) | Oct. 31, 2015 USD ($) | Nov. 01, 2014 USD ($) | Jan. 31, 2015 USD ($) | Jan. 31, 2007 CAD
Foreign Currency Cash Flow Hedge Liability at Fair Value |  |  | $ 10,000,000 |  | $ 10,000,000 |  |
Gain (Loss) on Foreign Currency Cash Flow Hedge Ineffectiveness |  |  |  | $ 0 |  |  |
Foreign Currency Cash Flow Hedge Asset at Fair Value |  | $ 27,000,000 |  | 27,000,000 |  | $ 21,000,000 |
Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax |  | 2,000,000 | 16,000,000 | 6,000,000 | 3,000,000 |  |
Other Income (Loss) [Member] |  |  |  |  |  |  |
(Gain) Loss Reclassified from Accumulated Other Comprehensive Income (Loss) into Other Income (Loss) | [1] | $ 3,000,000 | $ (13,000,000) | $ (7,000,000) | $ (5,000,000) |  |
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |  |
Derivative, Notional Amount | CAD |  |  |  |  |  |  | CAD 270
[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 Fair value as of the balance sheet date of all foreign currency derivative assets designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + 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=56946850&loc=SL5624171-113959 + Details
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- Definition Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + 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=56946850&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=56946850&loc=SL5624171-113959 + Details
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