Available-for-Sale Debt and Equity Investments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021	Jul. 31, 2021
Schedule of Investments [Line Items]
Marketable equity securities	$ 242		$ 242		$ 137
Net unrealized gains (losses) on marketable securities	(19)	$ 3	(32)	$ 3
Net loss (gain) on non-marketable equity securities measured using the measurement alternative	(11)	$ 3	(28)	$ (1)
Investments in privately held companies	1,900		1,900		1,500
Funding commitments	400		400
Variable Interest Entity, Not Primary Beneficiary
Schedule of Investments [Line Items]
Investments in privately held companies	1,200		1,200
Private equity funds | Fair value measured at NAV per share
Schedule of Investments [Line Items]
Equity interests held in certain private equity funds	$ 1,200		$ 1,200		$ 900