Available-for-Sale Debt and Equity Investments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 01, 2021	Apr. 25, 2020	May 01, 2021	Apr. 25, 2020	Jul. 25, 2020
Schedule of Investments [Line Items]
Net unrealized gains on marketable securities	$ 3		$ 3
Net loss (gain) on non-marketable equity securities measured using the measurement alternative	3	$ 4	(1)	$ 1
Investments in privately held companies	1,400		1,400		$ 1,300
Funding commitments	200		200
Variable Interest Entity, Not Primary Beneficiary
Schedule of Investments [Line Items]
Investments in privately held companies	800		800
Private equity funds | Fair value measured at NAV per share
Schedule of Investments [Line Items]
Equity interests held in certain private equity funds	$ 800		$ 800		$ 700