Available-for-Sale Debt and Equity Investments - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jan. 29, 2022	Jan. 29, 2022	Jul. 31, 2021
Schedule of Investments [Line Items]
Net unrealized gains (losses) on marketable securities	$ (18)	$ (13)
Net loss (gain) on non-marketable equity securities measured using the measurement alternative	(14)	(16)
Investments in privately held companies	1,800	1,800	$ 1,500
Funding commitments	400	400
Variable Interest Entity, Not Primary Beneficiary
Schedule of Investments [Line Items]
Investments in privately held companies	1,100	1,100
Private equity funds | Fair value measured at NAV per share
Schedule of Investments [Line Items]
Equity interests held in certain private equity funds	$ 1,100	$ 1,100	$ 900