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Fair Value Measurements and Concentrations of Credit Risk (Financial Assets Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Feb. 02, 2019 | Feb. 03, 2018
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Marketable equity and debt securities | $ 101 | $ 117
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Marketable equity and debt securities | 27 | 25
Significant Observable Inputs (Level 2) [Member] |  |
Marketable equity and debt securities | 74 | 92
Significant Unobservable Inputs (Level 3) [Member] |  |
Marketable equity and debt securities | $ 0 | $ 0

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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