Available-for-Sale Debt and Equity Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Oct. 29, 2022	Jul. 30, 2022
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	$ 6,649	$ 9,713
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(343)	(382)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	4,234	1,181
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(465)	(106)
TOTAL, Fair Value	10,883	10,894
TOTAL, Gross Unrealized Losses	(808)	(488)
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	530	1,110
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(12)	(44)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	944	120
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(58)	(5)
TOTAL, Fair Value	1,474	1,230
TOTAL, Gross Unrealized Losses	(70)	(49)
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	101	114
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(2)	(2)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	64	24
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(4)	(2)
TOTAL, Fair Value	165	138
TOTAL, Gross Unrealized Losses	(6)	(4)
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	257	264
UNREALIZED LOSSES 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	257	264
TOTAL, Gross Unrealized Losses	(1)	0
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	5,065	6,920
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(252)	(240)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	2,090	422
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(206)	(37)
TOTAL, Fair Value	7,155	7,342
TOTAL, Gross Unrealized Losses	(458)	(277)
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	651	1,305
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(76)	(96)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,136	615
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(197)	(62)
TOTAL, Fair Value	1,787	1,920
TOTAL, Gross Unrealized Losses	(273)	$ (158)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	45
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	45
TOTAL, Gross Unrealized Losses	$ 0