Available-for-Sale Debt and Equity Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Jul. 30, 2022	Jul. 31, 2021
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	$ 9,713	$ 2,910
Unrealized loss less than 12 months, Gross Unrealized Losses	(382)	(15)
Unrealized losses 12 months or greater, Fair Value	1,181	19
Unrealized losses 12 months or greater, Gross Unrealized Losses	(106)	0
Total, Fair Value	10,894	2,929
Total, Gross Unrealized Losses	(488)	(15)
U.S. government securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	1,110	468
Unrealized loss less than 12 months, Gross Unrealized Losses	(44)	0
Unrealized losses 12 months or greater, Fair Value	120	0
Unrealized losses 12 months or greater, Gross Unrealized Losses	(5)	0
Total, Fair Value	1,230	468
Total, Gross Unrealized Losses	(49)	0
U.S. government agency securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	114	26
Unrealized loss less than 12 months, Gross Unrealized Losses	(2)	0
Unrealized losses 12 months or greater, Fair Value	24	0
Unrealized losses 12 months or greater, Gross Unrealized Losses	(2)	0
Total, Fair Value	138	26
Total, Gross Unrealized Losses	(4)	0
Non-U.S. government and agency securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	264
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	264
Total, Gross Unrealized Losses	0
Corporate debt securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	6,920	1,086
Unrealized loss less than 12 months, Gross Unrealized Losses	(240)	(5)
Unrealized losses 12 months or greater, Fair Value	422	6
Unrealized losses 12 months or greater, Gross Unrealized Losses	(37)	0
Total, Fair Value	7,342	1,092
Total, Gross Unrealized Losses	(277)	(5)
U.S. agency mortgage-backed securities
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value	1,305	1,293
Unrealized loss less than 12 months, Gross Unrealized Losses	(96)	(10)
Unrealized losses 12 months or greater, Fair Value	615	13
Unrealized losses 12 months or greater, Gross Unrealized Losses	(62)	0
Total, Fair Value	1,920	1,306
Total, Gross Unrealized Losses	$ (158)	(10)
Commercial paper
Schedule of Investments [Line Items]
Unrealized loss less than 12 months, Fair Value		37
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		37
Total, Gross Unrealized Losses		$ 0