Investments - Available-for-Sale Investments With Gross Unrealized Losses (Details) - USD ($) $ in Millions	Jan. 24, 2026	Jul. 26, 2025
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	$ 1,281	$ 1,517
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(3)	(6)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,758	2,402
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(23)	(75)
TOTAL, Fair Value	3,039	3,919
TOTAL, Gross Unrealized Losses	(26)	(81)
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	710	1,076
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(2)	(6)
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	244	302
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(2)	(6)
TOTAL, Fair Value	954	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		8
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses		0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value		21
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses		0
TOTAL, Fair Value		29
TOTAL, Gross Unrealized Losses		0
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	116	292
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	116	292
TOTAL, Gross Unrealized Losses	0	0
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	422	106
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	(1)	0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	1,409	1,800
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(10)	(35)
TOTAL, Fair Value	1,831	1,906
TOTAL, Gross Unrealized Losses	(11)	(35)
Mortgage- and asset-backed securities
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value	33	5
UNREALIZED LOSSES LESS THAN 12 MONTHS, Gross Unrealized Losses	0	0
UNREALIZED LOSSES 12 MONTHS OR GREATER, Fair Value	105	279
UNREALIZED LOSSES 12 MONTHS OR GREATER, Gross Unrealized Losses	(11)	(34)
TOTAL, Fair Value	138	284
TOTAL, Gross Unrealized Losses	$ (11)	(34)
Commercial paper
Debt Securities, Available-for-sale [Line Items]
UNREALIZED LOSSES LESS THAN 12 MONTHS, Fair Value		30
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		30
TOTAL, Gross Unrealized Losses		$ 0