Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Jul. 26, 2025	Jul. 27, 2024
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	$ 1,517	$ 1,228
Unrealized loss less than 12 months, Gross Unrealized Losses	(6)	(4)
Unrealized losses 12 months or greater, Fair Value	2,402	5,764
Unrealized losses 12 months or greater, Gross Unrealized Losses	(75)	(320)
Total, Fair Value	3,919	6,992
Total, Gross Unrealized Losses	(81)	(324)
U.S. government securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	1,076	598
Unrealized loss less than 12 months, Gross Unrealized Losses	(6)	(2)
Unrealized losses 12 months or greater, Fair Value	302	1,399
Unrealized losses 12 months or greater, Gross Unrealized Losses	(6)	(26)
Total, Fair Value	1,378	1,997
Total, Gross Unrealized Losses	(12)	(28)
U.S. government agency securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	8	89
Unrealized loss less than 12 months, Gross Unrealized Losses	0	0
Unrealized losses 12 months or greater, Fair Value	21	109
Unrealized losses 12 months or greater, Gross Unrealized Losses	0	(2)
Total, Fair Value	29	198
Total, Gross Unrealized Losses	0	(2)
Non-U.S. government and agency securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	292	17
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	292	17
Total, Gross Unrealized Losses	0	0
Corporate debt securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	106	276
Unrealized loss less than 12 months, Gross Unrealized Losses	0	(1)
Unrealized losses 12 months or greater, Fair Value	1,800	2,818
Unrealized losses 12 months or greater, Gross Unrealized Losses	(35)	(115)
Total, Fair Value	1,906	3,094
Total, Gross Unrealized Losses	(35)	(116)
U.S. agency mortgage-backed securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	5	238
Unrealized loss less than 12 months, Gross Unrealized Losses	0	(1)
Unrealized losses 12 months or greater, Fair Value	279	1,438
Unrealized losses 12 months or greater, Gross Unrealized Losses	(34)	(177)
Total, Fair Value	284	1,676
Total, Gross Unrealized Losses	(34)	(178)
Commercial paper
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	30	10
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	30	10
Total, Gross Unrealized Losses	$ 0	$ 0