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Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Jan. 29, 2022 | Jul. 31, 2021
--- | --- | ---
Assets: |  |
Available-for-sale debt investments: | $ 14,161 | $ 15,206
U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments: | 1,687 | 1,794
U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 140 | 152
Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments: | 8,988 | 8,910
Non-U.S. government and agency securities |  |
Assets: |  |
Available-for-sale debt investments: |  | 3
Commercial paper |  |
Assets: |  |
Available-for-sale debt investments: | 614 | 1,190
Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments: | 209 | 295
Fair value, measurements, recurring |  |
Assets: |  |
Marketable equity securities | 221 | 137
Derivative assets | 77 | 126
Total | 18,621 | 22,327
Liabilities: |  |
Derivative liabilities | 38 | 20
Total | 38 | 20
Fair value, measurements, recurring | Money market funds |  |
Assets: |  |
Other assets: | 750 | 750
Fair value, measurements, recurring | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments: | 1,687 | 1,794
Fair value, measurements, recurring | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 140 | 152
Fair value, measurements, recurring | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments: | 8,988 | 8,910
Fair value, measurements, recurring | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments: | 2,523 | 2,862
Fair value, measurements, recurring | Non-U.S. government and agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 3
Fair value, measurements, recurring | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments: | 614 | 1,190
Fair value, measurements, recurring | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments: | 209 | 295
Fair value, measurements, recurring | Money market funds |  |
Assets: |  |
Cash equivalents: | 3,402 | 5,694
Fair value, measurements, recurring | Commercial paper |  |
Assets: |  |
Cash equivalents: | 10 | 114
Fair value, measurements, recurring | U.S. government securities |  |
Assets: |  |
Cash equivalents: | 0 | 300
Fair value, measurements, recurring | Level 1 |  |
Assets: |  |
Marketable equity securities | 221 | 137
Derivative assets | 0 | 0
Total | 4,373 | 6,581
Liabilities: |  |
Derivative liabilities | 0 | 0
Total | 0 | 0
Fair value, measurements, recurring | Level 1 | Money market funds |  |
Assets: |  |
Other assets: | 750 | 750
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 | Non-U.S. government and agency 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: | 3,402 | 5,694
Fair value, measurements, recurring | Level 1 | Commercial paper |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 1 | U.S. government securities |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 2 |  |
Assets: |  |
Marketable equity securities | 0 | 0
Derivative assets | 77 | 126
Total | 14,248 | 15,746
Liabilities: |  |
Derivative liabilities | 38 | 20
Total | 38 | 20
Fair value, measurements, recurring | Level 2 | Money market funds |  |
Assets: |  |
Other assets: | 0 | 0
Fair value, measurements, recurring | Level 2 | U.S. government securities |  |
Assets: |  |
Available-for-sale debt investments: | 1,687 | 1,794
Fair value, measurements, recurring | Level 2 | U.S. government agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 140 | 152
Fair value, measurements, recurring | Level 2 | Corporate debt securities |  |
Assets: |  |
Available-for-sale debt investments: | 8,988 | 8,910
Fair value, measurements, recurring | Level 2 | U.S. agency mortgage-backed securities |  |
Assets: |  |
Available-for-sale debt investments: | 2,523 | 2,862
Fair value, measurements, recurring | Level 2 | Non-U.S. government and agency securities |  |
Assets: |  |
Available-for-sale debt investments: | 0 | 3
Fair value, measurements, recurring | Level 2 | Commercial paper |  |
Assets: |  |
Available-for-sale debt investments: | 614 | 1,190
Fair value, measurements, recurring | Level 2 | Certificates of deposit |  |
Assets: |  |
Available-for-sale debt investments: | 209 | 295
Fair value, measurements, recurring | Level 2 | Money market funds |  |
Assets: |  |
Cash equivalents: | 0 | 0
Fair value, measurements, recurring | Level 2 | Commercial paper |  |
Assets: |  |
Cash equivalents: | 10 | 114
Fair value, measurements, recurring | Level 2 | U.S. government securities |  |
Assets: |  |
Cash equivalents: | $ 0 | $ 300

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