Investments - Summary of Available-for-Sale Debt Investments (Details) - USD ($) $ in Millions	Oct. 26, 2024	Jul. 27, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 9,447	$ 10,212
Gross Unrealized Gains	12	7
Gross Unrealized and Credit Losses	(265)	(354)
Fair Value	9,194	9,865
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,390	2,380
Gross Unrealized Gains	2	1
Gross Unrealized and Credit Losses	(24)	(28)
Fair Value	2,368	2,353
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	154	223
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	(1)	(2)
Fair Value	153	221
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	388	370
Gross Unrealized Gains	1	1
Gross Unrealized and Credit Losses	0	0
Fair Value	389	371
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,610	3,818
Gross Unrealized Gains	9	5
Gross Unrealized and Credit Losses	(107)	(146)
Fair Value	3,512	3,677
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,038	1,959
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	(133)	(178)
Fair Value	905	1,781
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,193	1,023
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0	0
Fair Value	1,193	1,023
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	674	439
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0	0
Fair Value	$ 674	$ 439