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Fair Value - Assets and Liabilities Measured At Fair Value On Recurring Basis (Details) - USD ($) $ in Millions | Jul. 31, 2021 | Jul. 25, 2020
--- | --- | ---
Assets: |  |
Available-for-sale debt investments | $ 15,206 | $ 17,610
U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments | 1,794 | 2,685
U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments | 152 | 110
Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments | 8,910 | 11,877
Non-U.S. government and agency securities |  |
Assets: |  |
Available-for-sale debt investments | 3 |
Commercial paper |  |
Assets: |  |
Available-for-sale debt investments | 1,190 | 727
Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments | 295 | 176
Recurring |  |
Assets: |  |
Marketable equity securities | 137 | 0
Derivative assets | 126 | 191
Total | 22,327 | 27,496
Liabilities: |  |
Derivative liabilities | 20 | 10
Total | 20 | 10
Recurring | Money market funds |  |
Assets: |  |
Money market funds | 750 | 0
Recurring | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments | 1,794 | 2,685
Recurring | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments | 152 | 110
Recurring | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments | 8,910 | 11,877
Recurring | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments | 2,862 | 2,035
Recurring | Non-U.S. government and agency securities |  |
Assets: |  |
Available-for-sale debt investments | 3 | 0
Recurring | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments | 1,190 | 727
Recurring | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments | 295 | 176
Recurring | Money market funds |  |
Assets: |  |
Cash equivalents | 5,694 | 9,687
Recurring | Commercial paper |  |
Assets: |  |
Cash equivalents | 114 | 0
Recurring | U.S. government securities |  |
Assets: |  |
Cash equivalents | 300 | 0
Recurring | Corporate debt securities |  |
Assets: |  |
Cash equivalents | 0 | 8
Recurring | Level 1 |  |
Assets: |  |
Marketable equity securities | 137 | 0
Derivative assets | 0 | 0
Total | 6,581 | 9,687
Liabilities: |  |
Derivative liabilities | 0 | 0
Total | 0 | 0
Recurring | Level 1 | Money market funds |  |
Assets: |  |
Money market funds | 750 | 0
Recurring | Level 1 | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments | 0 | 0
Recurring | Level 1 | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments | 0 | 0
Recurring | Level 1 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments | 0 | 0
Recurring | Level 1 | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments | 0 | 0
Recurring | Level 1 | Non-U.S. government and agency securities |  |
Assets: |  |
Available-for-sale debt investments | 0 | 0
Recurring | Level 1 | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments | 0 | 0
Recurring | Level 1 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments | 0 | 0
Recurring | Level 1 | Money market funds |  |
Assets: |  |
Cash equivalents | 5,694 | 9,687
Recurring | Level 1 | Commercial paper |  |
Assets: |  |
Cash equivalents | 0 | 0
Recurring | Level 1 | U.S. government securities |  |
Assets: |  |
Cash equivalents | 0 | 0
Recurring | Level 1 | Corporate debt securities |  |
Assets: |  |
Cash equivalents | 0 | 0
Recurring | Level 2 |  |
Assets: |  |
Marketable equity securities | 0 | 0
Derivative assets | 126 | 190
Total | 15,746 | 17,808
Liabilities: |  |
Derivative liabilities | 20 | 10
Total | 20 | 10
Recurring | Level 2 | Money market funds |  |
Assets: |  |
Money market funds | 0 | 0
Recurring | Level 2 | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments | 1,794 | 2,685
Recurring | Level 2 | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments | 152 | 110
Recurring | Level 2 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments | 8,910 | 11,877
Recurring | Level 2 | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments | 2,862 | 2,035
Recurring | Level 2 | Non-U.S. government and agency securities |  |
Assets: |  |
Available-for-sale debt investments | 3 | 0
Recurring | Level 2 | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments | 1,190 | 727
Recurring | Level 2 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments | 295 | 176
Recurring | Level 2 | Money market funds |  |
Assets: |  |
Cash equivalents | 0 | 0
Recurring | Level 2 | Commercial paper |  |
Assets: |  |
Cash equivalents | 114 | 0
Recurring | Level 2 | U.S. government securities |  |
Assets: |  |
Cash equivalents | 300 | 0
Recurring | Level 2 | Corporate debt securities |  |
Assets: |  |
Cash equivalents | $ 0 | 8
Recurring | Level 3 |  |
Assets: |  |
Marketable equity securities |  | 0
Derivative assets |  | 1
Total |  | 1
Liabilities: |  |
Derivative liabilities |  | 0
Total |  | 0
Recurring | Level 3 | Money market funds |  |
Assets: |  |
Money market funds |  | 0
Recurring | Level 3 | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments |  | 0
Recurring | Level 3 | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments |  | 0
Recurring | Level 3 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments |  | 0
Recurring | Level 3 | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments |  | 0
Recurring | Level 3 | Non-U.S. government and agency securities |  |
Assets: |  |
Available-for-sale debt investments |  | 0
Recurring | Level 3 | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments |  | 0
Recurring | Level 3 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments |  | 0
Recurring | Level 3 | Money market funds |  |
Assets: |  |
Cash equivalents |  | 0
Recurring | Level 3 | Commercial paper |  |
Assets: |  |
Cash equivalents |  | 0
Recurring | Level 3 | U.S. government securities |  |
Assets: |  |
Cash equivalents |  | 0
Recurring | Level 3 | Corporate debt securities |  |
Assets: |  |
Cash equivalents |  | $ 0

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