Balance Sheet and Other Details - Remaining Performance Obligations (Details) - USD ($) $ in Millions	Oct. 26, 2024	Jul. 27, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 39,990	$ 41,048
Deferred revenue	$ 27,502	28,475
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-28
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation		$ 20,882
Period for amount to be recognized as revenue	12 months
Amount to be recognized as revenue over the next 12 months		51.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-27
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 20,310
Period for amount to be recognized as revenue		12 months
Amount to be recognized as revenue over the next 12 months	51.00%
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		$ 20,166
Period for amount to be recognized as revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-27
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 19,680
Period for amount to be recognized as revenue
Unbilled contract revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 12,488	$ 12,573
Product
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	19,882	20,055
Deferred revenue	12,941	13,219
Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	20,108	20,993
Deferred revenue	$ 14,561	$ 15,256