Available-for-Sale Debt and Equity Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Apr. 29, 2023	Jul. 30, 2022
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	$ 2,603	$ 9,713
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(22)	(382)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	7,618	1,181
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(507)	(106)
TOTAL, Fair Value	10,221	10,894
TOTAL, Gross Unrealized Losses	(529)	(488)
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	360	1,110
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(2)	(44)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,125	120
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(40)	(5)
TOTAL, Fair Value	1,485	1,230
TOTAL, Gross Unrealized Losses	(42)	(49)
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	148	114
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(1)	(2)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	110	24
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(3)	(2)
TOTAL, Fair Value	258	138
TOTAL, Gross Unrealized Losses	(4)	(4)
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	291	264
UNREALIZED LOSSES 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	291	264
TOTAL, Gross Unrealized Losses	0	0
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	1,387	6,920
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(14)	(240)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	4,869	422
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(261)	(37)
TOTAL, Fair Value	6,256	7,342
TOTAL, Gross Unrealized Losses	(275)	(277)
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	343	1,305
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(5)	(96)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,514	615
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(203)	(62)
TOTAL, Fair Value	1,857	1,920
TOTAL, Gross Unrealized Losses	(208)	$ (158)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	69
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	69
TOTAL, Gross Unrealized Losses	0
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	5
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	5
TOTAL, Gross Unrealized Losses	$ 0