Balance Sheet and Other Details - Deferred Revenue (Details) - USD ($) $ in Millions	Jul. 26, 2025	Jul. 27, 2024
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 28,779	$ 28,475
Current	16,416	16,249
Noncurrent	12,363	12,226
Product
Disaggregation of Revenue [Line Items]
Deferred revenue	13,490	13,219
Services
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 15,289	$ 15,256