Balance Sheet and Other Details - Remaining Performance Obligations (Details) - USD ($) $ in Millions	Jan. 25, 2025	Jul. 27, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 41,268	$ 41,048
Deferred revenue	27,795	28,475
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-26
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 21,017
Period for amount to be recognized as revenue
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]: 2025-01-26
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 20,251
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
Unbilled contract revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 13,473	$ 12,573
Product
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	20,321	20,055
Deferred revenue	13,033	13,219
Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	20,947	20,993
Deferred revenue	$ 14,762	$ 15,256