Balance Sheet and Other Details - Remaining Performance Obligations (Details) - USD ($) $ in Millions	Jan. 24, 2026	Jul. 26, 2025
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 43,406	$ 43,533
Deferred revenue	28,403	28,779
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-07-27
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation		$ 21,723
Period for amount to be recognized as revenue		12 months
Amount to be recognized as revenue over the next 12 months		50.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-25
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 21,370
Period for amount to be recognized as revenue	12 months
Amount to be recognized as revenue over the next 12 months	49.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-07-26
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation		$ 21,810
Period for amount to be recognized as revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-01-24
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 22,036
Period for amount to be recognized as revenue
Unbilled contract revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 15,003	$ 14,754
Product
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	21,977	21,572
Deferred revenue	13,371	13,490
Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	21,429	21,961
Deferred revenue	$ 15,032	$ 15,289