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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Jan. 23, 2021 | Jul. 25, 2020
--- | --- | ---
Assets: |  |
Available-for-sale debt investments: | $ 18,790 | $ 17,610
U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments: | 2,663 | 2,685
U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 168 | 110
Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments: | 10,786 | 11,877
Commercial paper |  |
Assets: |  |
Available-for-sale debt investments: | 1,730 | 727
Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments: | 603 | 176
Fair value, measurements, recurring |  |
Assets: |  |
Marketable equity securities | 5 | 0
Derivative assets | 171 | 191
Total | 28,553 | 27,833
Liabilities: |  |
Derivative liabilities | 26 | 10
Total | 26 | 10
Fair value, measurements, recurring | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments: | 2,663 | 2,685
Fair value, measurements, recurring | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 168 | 110
Fair value, measurements, recurring | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments: | 10,786 | 11,877
Fair value, measurements, recurring | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments: | 2,840 | 2,035
Fair value, measurements, recurring | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments: | 1,730 | 727
Fair value, measurements, recurring | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments: | 603 | 176
Fair value, measurements, recurring | Money market funds |  |
Assets: |  |
Cash equivalents: | 8,515 | 10,024
Fair value, measurements, recurring | Corporate debt securities |  |
Assets: |  |
Cash equivalents: | 9 | 8
Fair value, measurements, recurring | Certificates of deposit |  |
Assets: |  |
Cash equivalents: | 161 | 0
Fair value, measurements, recurring | Commercial paper |  |
Assets: |  |
Cash equivalents: | 902 | 0
Fair value, measurements, recurring | Level 1 |  |
Assets: |  |
Marketable equity securities | 5 | 0
Derivative assets | 0 | 0
Total | 8,520 | 10,024
Liabilities: |  |
Derivative liabilities | 0 | 0
Total | 0 | 0
Fair value, measurements, recurring | Level 1 | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 1 | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 1 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 1 | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 1 | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 1 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 1 | Money market funds |  |
Assets: |  |
Cash equivalents: | 8,515 | 10,024
Fair value, measurements, recurring | Level 1 | Corporate debt securities |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 1 | Certificates of deposit |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 1 | Commercial paper |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 2 |  |
Assets: |  |
Marketable equity securities | 0 | 0
Derivative assets | 165 | 190
Total | 20,027 | 17,808
Liabilities: |  |
Derivative liabilities | 26 | 10
Total | 26 | 10
Fair value, measurements, recurring | Level 2 | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments: | 2,663 | 2,685
Fair value, measurements, recurring | Level 2 | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 168 | 110
Fair value, measurements, recurring | Level 2 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments: | 10,786 | 11,877
Fair value, measurements, recurring | Level 2 | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments: | 2,840 | 2,035
Fair value, measurements, recurring | Level 2 | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments: | 1,730 | 727
Fair value, measurements, recurring | Level 2 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments: | 603 | 176
Fair value, measurements, recurring | Level 2 | Money market funds |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 2 | Corporate debt securities |  |
Assets: |  |
Cash equivalents: | 9 | 8
Fair value, measurements, recurring | Level 2 | Certificates of deposit |  |
Assets: |  |
Cash equivalents: | 161 | 0
Fair value, measurements, recurring | Level 2 | Commercial paper |  |
Assets: |  |
Cash equivalents: | 902 | 0
Fair value, measurements, recurring | Level 3 |  |
Assets: |  |
Marketable equity securities | 0 | 0
Derivative assets | 6 | 1
Total | 6 | 1
Liabilities: |  |
Derivative liabilities | 0 | 0
Total | 0 | 0
Fair value, measurements, recurring | Level 3 | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 3 | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 3 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 3 | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 3 | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 3 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 0
Fair value, measurements, recurring | Level 3 | Money market funds |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 3 | Corporate debt securities |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 3 | Certificates of deposit |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 3 | Commercial paper |  |
Assets: |  |
Cash equivalents: | $ 0 | $ 0

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