Cash Equivalents and Marketable Securities - Unrealized Losses Aggregated by Investment Category (Details) - USD ($) $ in Millions	Jan. 25, 2026	Jan. 26, 2025
Estimated Fair Value
Less than 12 Months	$ 13,132	$ 12,422
Gross Unrealized Loss
Less than 12 Months	(6)	(56)
Debt securities issued by the U.S. Treasury
Estimated Fair Value
Less than 12 Months	10,666	6,315
Gross Unrealized Loss
Less than 12 Months	(3)	(22)
Corporate debt securities
Estimated Fair Value
Less than 12 Months	1,332	5,291
Gross Unrealized Loss
Less than 12 Months	(3)	(29)
Debt securities issued by U.S. government agencies
Estimated Fair Value
Less than 12 Months	1,134	816
Gross Unrealized Loss
Less than 12 Months	$ 0	$ (5)