Balance Sheet and Other Details - Remaining Performance Obligations (Details) - USD ($) $ in Millions	Jul. 26, 2025	Jul. 27, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 43,533	$ 41,048
Deferred revenue	28,779	28,475
Unbilled contract revenue
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	14,754	12,573
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]: 2025-07-27
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 21,723	$ 20,166
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]: 2026-07-26
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 21,810
Period for amount to be recognized as revenue
Product
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 21,572	$ 20,055
Deferred revenue	13,490	13,219
Services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	21,961	20,993
Deferred revenue	$ 15,289	$ 15,256