Fair Value Measurements - Financial Assets Measured At Fair Value On A Recurring and Nonrecurring Basis (Details) - USD ($) $ in Millions	Jul. 29, 2023	Jul. 30, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable equity and debt securities	$ 39	$ 34
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable equity and debt securities	39	34
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable equity and debt securities	0	0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Marketable equity and debt securities	$ 0	$ 0