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Available-for-Sale Debt and Equity Investments - Gross Realized Gains and Gross Realized Losses Related to Available-for-Sale Investment (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 29, 2022
Jan. 23, 2021
Jan. 29, 2022
Jan. 23, 2021
Investments, Debt and Equity Securities [Abstract]        
Gross realized gains $ 13 $ 9 $ 19 $ 24
Gross realized losses (3) 0 (3) 0
Total $ 10 $ 9 $ 16 $ 24