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Available-for-Sale Debt and Equity Investments - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020
Schedule of Investments [Line Items]
Net unrealized gains on marketable securities	$ 8
Net loss (gain) on non-marketable equity securities measured using the measurement alternative	(39)	$ 13
Investments in privately held companies	1,500
Funding commitments	200
Variable Interest Entity, Not Primary Beneficiary
Schedule of Investments [Line Items]
Investments in privately held companies	900
Net Asset Value (NAV) | Private equity funds
Schedule of Investments [Line Items]
Non-marketable equity securities included in other assets	$ 900	$ 700

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