Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Oct. 25, 2025	Jul. 26, 2025
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	$ 82	$ 1,517
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	(6)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	2,179	2,402
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(38)	(75)
TOTAL, Fair Value	2,261	3,919
TOTAL, Gross Unrealized Losses	(38)	(81)
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	0	1,076
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	(6)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	436	302
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(4)	(6)
TOTAL, Fair Value	436	1,378
TOTAL, Gross Unrealized Losses	(4)	(12)
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	5	8
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	0	21
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	0	0
TOTAL, Fair Value	5	29
TOTAL, Gross Unrealized Losses	0	0
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value		292
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		292
TOTAL, Gross Unrealized Losses		0
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	63	106
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,583	1,800
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(18)	(35)
TOTAL, Fair Value	1,646	1,906
TOTAL, Gross Unrealized Losses	(18)	(35)
Mortgage- and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	4	5
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	160	279
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(16)	(34)
TOTAL, Fair Value	164	284
TOTAL, Gross Unrealized Losses	(16)	(34)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	10	30
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	10	30
TOTAL, Gross Unrealized Losses	$ 0	$ 0