v3.26.1
Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 25, 2026
Jul. 26, 2025
Jul. 27, 2024
Disaggregation of Revenue [Line Items]      
Total revenue $ 63,325 $ 56,654 $ 53,803
Product      
Disaggregation of Revenue [Line Items]      
Total revenue 48,295 41,608 39,253
Networking      
Disaggregation of Revenue [Line Items]      
Total revenue 34,668 28,304 29,229
Security      
Disaggregation of Revenue [Line Items]      
Total revenue 8,232 8,094 5,075
Collaboration      
Disaggregation of Revenue [Line Items]      
Total revenue 4,300 4,154 4,113
Observability      
Disaggregation of Revenue [Line Items]      
Total revenue 1,095 1,055 837
Services      
Disaggregation of Revenue [Line Items]      
Total revenue 15,030 15,046 14,550
Subscription      
Disaggregation of Revenue [Line Items]      
Total revenue 31,977 31,526 27,380
Subscription, Product      
Disaggregation of Revenue [Line Items]      
Total revenue 18,314 17,783 14,078
Subscription, Service      
Disaggregation of Revenue [Line Items]      
Total revenue $ 13,663 $ 13,743 $ 13,302