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Fair Value Measurements (Financial Assets Measured At Fair Value On A Recurring and Nonrecurring Basis) (Details) - USD ($) $ in Millions | Aug. 04, 2018 | Jul. 29, 2017
--- | --- | ---
Marketable equity and debt securities | $ 96 | $ 99
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Marketable equity and debt securities | 27 | 22
Significant Observable Inputs (Level 2) [Member] |  |
Marketable equity and debt securities | 69 | 77
Significant Unobservable Inputs (Level 3) [Member] |  |
Marketable equity and debt securities | $ 0 | $ 0

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