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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Jul. 30, 2022 | Jul. 31, 2021 | Jul. 25, 2020
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 51,557 | $ 49,818 | $ 49,301
Product |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 38,018 | 36,014 | 35,978
Secure, Agile Networks |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 23,829 | 22,722 | 23,265
Internet for the Future |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 5,278 | 4,514 | 4,180
Collaboration |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 4,472 | 4,727 | 4,823
End-to-End Security |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 3,699 | 3,382 | 3,158
Optimized Application Experiences |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 729 | 654 | 524
Other Products |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 11 | 15 | 28
Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 13,539 | $ 13,804 | $ 13,323

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