Investments - Summary of Available-for-Sale Debt Investments (Details) - USD ($) $ in Millions	Jan. 25, 2025	Jul. 27, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 8,186	$ 10,212
Gross Unrealized Gains	7	7
Gross Unrealized and Credit Losses	(235)	(354)
Fair Value	7,958	9,865
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,177	2,380
Gross Unrealized Gains	0	1
Gross Unrealized and Credit Losses	(29)	(28)
Fair Value	2,148	2,353
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	112	223
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	(1)	(2)
Fair Value	111	221
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	363	370
Gross Unrealized Gains	1	1
Gross Unrealized and Credit Losses	0	0
Fair Value	364	371
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,292	3,818
Gross Unrealized Gains	6	5
Gross Unrealized and Credit Losses	(94)	(146)
Fair Value	3,204	3,677
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	847	1,959
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	(111)	(178)
Fair Value	736	1,781
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	732	1,023
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0	0
Fair Value	732	1,023
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	663	439
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0	0
Fair Value	$ 663	$ 439