Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Jul. 29, 2023	Jul. 30, 2022
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	$ 5,593	$ 9,713
Unrealized loss less than 12 months, Gross Unrealized Losses	(64)	(382)
Unrealized losses 12 months or greater, Fair Value	6,756	1,181
Unrealized losses 12 months or greater, Gross Unrealized Losses	(531)	(106)
Total, Fair Value	12,349	10,894
Total, Gross Unrealized Losses	(595)	(488)
U.S. government securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	2,394	1,110
Unrealized loss less than 12 months, Gross Unrealized Losses	(26)	(44)
Unrealized losses 12 months or greater, Fair Value	931	120
Unrealized losses 12 months or greater, Gross Unrealized Losses	(36)	(5)
Total, Fair Value	3,325	1,230
Total, Gross Unrealized Losses	(62)	(49)
U.S. government agency securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	343	114
Unrealized loss less than 12 months, Gross Unrealized Losses	(2)	(2)
Unrealized losses 12 months or greater, Fair Value	72	24
Unrealized losses 12 months or greater, Gross Unrealized Losses	(3)	(2)
Total, Fair Value	415	138
Total, Gross Unrealized Losses	(5)	(4)
Non-U.S. government and agency securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	363	264
Unrealized loss less than 12 months, Gross Unrealized Losses	(1)	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	363	264
Total, Gross Unrealized Losses	(1)	0
Corporate debt securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	1,736	6,920
Unrealized loss less than 12 months, Gross Unrealized Losses	(22)	(240)
Unrealized losses 12 months or greater, Fair Value	4,315	422
Unrealized losses 12 months or greater, Gross Unrealized Losses	(275)	(37)
Total, Fair Value	6,051	7,342
Total, Gross Unrealized Losses	(297)	(277)
U.S. agency mortgage-backed securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	658	1,305
Unrealized loss less than 12 months, Gross Unrealized Losses	(13)	(96)
Unrealized losses 12 months or greater, Fair Value	1,438	615
Unrealized losses 12 months or greater, Gross Unrealized Losses	(217)	(62)
Total, Fair Value	2,096	1,920
Total, Gross Unrealized Losses	(230)	$ (158)
Commercial paper
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	97
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	97
Total, Gross Unrealized Losses	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