Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Jan. 27, 2024	Jul. 29, 2023
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	$ 2,551	$ 5,593
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(17)	(64)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	5,436	6,756
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(396)	(531)
TOTAL, Fair Value	7,987	12,349
TOTAL, Gross Unrealized Losses	(413)	(595)
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	1,145	2,394
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(9)	(26)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	550	931
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(25)	(36)
TOTAL, Fair Value	1,695	3,325
TOTAL, Gross Unrealized Losses	(34)	(62)
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	224	343
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	(2)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	39	72
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(2)	(3)
TOTAL, Fair Value	263	415
TOTAL, Gross Unrealized Losses	(2)	(5)
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	200	363
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	(1)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	0	0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	0	0
TOTAL, Fair Value	200	363
TOTAL, Gross Unrealized Losses	0	(1)
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	557	1,736
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(2)	(22)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	3,527	4,315
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(178)	(275)
TOTAL, Fair Value	4,084	6,051
TOTAL, Gross Unrealized Losses	(180)	(297)
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	415	658
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(6)	(13)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,320	1,438
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(191)	(217)
TOTAL, Fair Value	1,735	2,096
TOTAL, Gross Unrealized Losses	(197)	(230)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	10	97
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	0	0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	0	0
TOTAL, Fair Value	10	97
TOTAL, Gross Unrealized Losses	$ 0	0
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value		2
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses		0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value		0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses		0
TOTAL, Fair Value		2
TOTAL, Gross Unrealized Losses		$ 0