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Fair Value Measurements (Financial Assets Measured At Fair Value On A Recurring and Nonrecurring Basis) (Details) - USD ($)
$ in Millions
Jul. 30, 2022
Jul. 31, 2021
Marketable equity and debt securities $ 34 $ 46
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Marketable equity and debt securities 34 39
Significant Observable Inputs (Level 2) [Member]    
Marketable equity and debt securities 0 7
Significant Unobservable Inputs (Level 3) [Member]    
Marketable equity and debt securities $ 0 $ 0