Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Jul. 27, 2024	Jul. 29, 2023
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	$ 1,228	$ 5,593
Unrealized loss less than 12 months, Gross Unrealized Losses	(4)	(64)
Unrealized losses 12 months or greater, Fair Value	5,764	6,756
Unrealized losses 12 months or greater, Gross Unrealized Losses	(320)	(531)
Total, Fair Value	6,992	12,349
Total, Gross Unrealized Losses	(324)	(595)
U.S. government securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	598	2,394
Unrealized loss less than 12 months, Gross Unrealized Losses	(2)	(26)
Unrealized losses 12 months or greater, Fair Value	1,399	931
Unrealized losses 12 months or greater, Gross Unrealized Losses	(26)	(36)
Total, Fair Value	1,997	3,325
Total, Gross Unrealized Losses	(28)	(62)
U.S. government agency securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	89	343
Unrealized loss less than 12 months, Gross Unrealized Losses	0	(2)
Unrealized losses 12 months or greater, Fair Value	109	72
Unrealized losses 12 months or greater, Gross Unrealized Losses	(2)	(3)
Total, Fair Value	198	415
Total, Gross Unrealized Losses	(2)	(5)
Non-U.S. government and agency securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	17	363
Unrealized loss 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	17	363
Total, Gross Unrealized Losses	0	(1)
Corporate debt securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	276	1,736
Unrealized loss less than 12 months, Gross Unrealized Losses	(1)	(22)
Unrealized losses 12 months or greater, Fair Value	2,818	4,315
Unrealized losses 12 months or greater, Gross Unrealized Losses	(115)	(275)
Total, Fair Value	3,094	6,051
Total, Gross Unrealized Losses	(116)	(297)
U.S. agency mortgage-backed securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	238	658
Unrealized loss less than 12 months, Gross Unrealized Losses	(1)	(13)
Unrealized losses 12 months or greater, Fair Value	1,438	1,438
Unrealized losses 12 months or greater, Gross Unrealized Losses	(177)	(217)
Total, Fair Value	1,676	2,096
Total, Gross Unrealized Losses	(178)	(230)
Commercial paper
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	10	97
Unrealized loss 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
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value		2
Unrealized loss 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