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Fair Value Measurements (Financial Assets Measured At Fair Value On A Recurring and Nonrecurring Basis) (Details) - USD ($) $ in Millions | Aug. 01, 2020 | Aug. 03, 2019
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Marketable equity and debt securities | $ 143 | $ 112
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Marketable equity and debt securities | 32 | 31
Significant Observable Inputs (Level 2) [Member] |  |
Marketable equity and debt securities | 111 | 81
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=117815213&loc=d3e19207-110258 + Details
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