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Available-for-Sale Debt and Equity Investments - Summary of Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 25, 2020
Schedule of Investments [Line Items]
Amortized Cost	$ 14,978	$ 17,163
Gross Unrealized Gains	268	454
Gross Unrealized and Credit Losses	(40)
Gross Unrealized and Credit Losses		(7)
Fair Value	15,206	17,610
U.S. government securities
Schedule of Investments [Line Items]
Amortized Cost	1,773	2,614
Gross Unrealized Gains	21	71
Gross Unrealized and Credit Losses	0
Gross Unrealized and Credit Losses		0
Fair Value	1,794	2,685
U.S. government agency securities
Schedule of Investments [Line Items]
Amortized Cost	152	110
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0
Gross Unrealized and Credit Losses		0
Fair Value	152	110
Non-U.S. government and agency securities
Schedule of Investments [Line Items]
Amortized Cost	3
Gross Unrealized Gains	0
Gross Unrealized and Credit Losses	0
Fair Value	3
Corporate debt securities
Schedule of Investments [Line Items]
Amortized Cost	8,727	11,549
Gross Unrealized Gains	213	334
Gross Unrealized and Credit Losses	(30)
Gross Unrealized and Credit Losses		(6)
Fair Value	8,910	11,877
U.S. agency mortgage-backed securities
Schedule of Investments [Line Items]
Amortized Cost	2,838	1,987
Gross Unrealized Gains	34	49
Gross Unrealized and Credit Losses	(10)
Gross Unrealized and Credit Losses		(1)
Fair Value	2,862	2,035
Commercial paper
Schedule of Investments [Line Items]
Amortized Cost	1,190	727
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0
Gross Unrealized and Credit Losses		0
Fair Value	1,190	727
Certificates of deposit
Schedule of Investments [Line Items]
Amortized Cost	295	176
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0
Gross Unrealized and Credit Losses		0
Fair Value	$ 295	$ 176

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Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax And Allowance For Credit Loss

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