Available-for-Sale Debt and Equity Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Jan. 28, 2023	Jul. 30, 2022
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	$ 3,957	$ 9,713
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(113)	(382)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	5,980	1,181
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(448)	(106)
TOTAL, Fair Value	9,937	10,894
TOTAL, Gross Unrealized Losses	(561)	(488)
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	470	1,110
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(6)	(44)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,086	120
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(48)	(5)
TOTAL, Fair Value	1,556	1,230
TOTAL, Gross Unrealized Losses	(54)	(49)
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	33	114
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	(2)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	121	24
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(5)	(2)
TOTAL, Fair Value	154	138
TOTAL, Gross Unrealized Losses	(5)	(4)
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	339	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	339	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	2,770	6,920
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(94)	(240)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	3,333	422
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(219)	(37)
TOTAL, Fair Value	6,103	7,342
TOTAL, Gross Unrealized Losses	(313)	(277)
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	305	1,305
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(12)	(96)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,440	615
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(176)	(62)
TOTAL, Fair Value	1,745	1,920
TOTAL, Gross Unrealized Losses	(188)	$ (158)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	40
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	40
TOTAL, Gross Unrealized Losses	$ 0