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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
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