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Goodwill and Purchased Intangible Assets - Schedule of Intangible Assets Acquired Through Business Combinations (Details) $ in Millions | 12 Months Ended
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Jul. 31, 2021 USD ($) acquisition | Jul. 25, 2020 USD ($) acquisition | Jul. 27, 2019 acquisition
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Number of business combinations (acquisition) | acquisition | 13 | 6 | 5
Total intangible assets acquired | $ 2,914 | $ 172 |
Acacia |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Total intangible assets acquired | 2,160 |  |
Others |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Total intangible assets acquired | 754 |  |
IPR&D |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Indefinite-lived intangible assets acquired | 345 | $ 0 |
IPR&D | Acacia |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Indefinite-lived intangible assets acquired | 345 |  |
IPR&D | Others |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Indefinite-lived intangible assets acquired | 0 |  |
TECHNOLOGY |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) |  | 4 years 9 months 18 days |
Finite lived intangible assets acquired | $ 1,835 | $ 161 |
TECHNOLOGY | Acacia |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) | 4 years |  |
Finite lived intangible assets acquired | $ 1,290 |  |
TECHNOLOGY | Others |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) | 4 years 3 months 18 days |  |
Finite lived intangible assets acquired | $ 545 |  |
CUSTOMER RELATIONSHIPS |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) |  | 4 years 2 months 12 days |
Finite lived intangible assets acquired | $ 664 | $ 10 |
CUSTOMER RELATIONSHIPS | Acacia |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) | 4 years |  |
Finite lived intangible assets acquired | $ 490 |  |
CUSTOMER RELATIONSHIPS | Others |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) | 4 years 7 months 6 days |  |
Finite lived intangible assets acquired | $ 174 |  |
OTHER |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) |  | 1 year 6 months |
Finite lived intangible assets acquired | $ 70 | $ 1 |
OTHER | Acacia |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) | 3 years 1 month 6 days |  |
Finite lived intangible assets acquired | $ 35 |  |
OTHER | Others |  |  |
Schedule Of Finite Lived And Indefinite Lived Intangible Assets Acquired Through Business Combinations [Line Items] |  |  |
Weighted- Average Useful Life (in Years) | 2 years 10 months 24 days |  |
Finite lived intangible assets acquired | $ 35 |  |

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