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Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Millions | Oct. 31, 2021 | Jul. 31, 2021
--- | --- | ---
Assets: |  |
Cash equivalents, primarily money market funds and time deposits | $ 2,864 | $ 2,562
Available-for-sale debt securities: | 584 | 1,508
Long-term debt | 2,037 | 2,034
Senior Unsecured Notes |  |
Assets: |  |
Long-term debt | 1,990 |
Fair value, measurements, recurring |  |
Assets: |  |
Cash equivalents, primarily money market funds and time deposits | 696 | 1,660
Available-for-sale debt securities: | 584 | 1,508
Total assets measured at fair value on a recurring basis | 1,280 | 3,168
Fair value, measurements, recurring | Senior Unsecured Notes |  |
Assets: |  |
Senior unsecured notes | 1,972 | 1,986
Fair value, measurements, recurring | Level 1 |  |
Assets: |  |
Cash equivalents, primarily money market funds and time deposits | 696 | 1,660
Available-for-sale debt securities: | 0 | 0
Total assets measured at fair value on a recurring basis | 696 | 1,660
Fair value, measurements, recurring | Level 1 | Senior Unsecured Notes |  |
Assets: |  |
Senior unsecured notes | 0 | 0
Fair value, measurements, recurring | Level 2 |  |
Assets: |  |
Cash equivalents, primarily money market funds and time deposits | 0 | 0
Available-for-sale debt securities: | 584 | 1,508
Total assets measured at fair value on a recurring basis | 584 | 1,508
Fair value, measurements, recurring | Level 2 | Senior Unsecured Notes |  |
Assets: |  |
Senior unsecured notes | 1,972 | 1,986
Fair value, measurements, recurring | Municipal bonds |  |
Assets: |  |
Available-for-sale debt securities: | 0 | 38
Fair value, measurements, recurring | Municipal bonds | Level 1 |  |
Assets: |  |
Available-for-sale debt securities: | 0 | 0
Fair value, measurements, recurring | Municipal bonds | Level 2 |  |
Assets: |  |
Available-for-sale debt securities: | 0 | 38
Fair value, measurements, recurring | Corporate notes |  |
Assets: |  |
Available-for-sale debt securities: | 544 | 1,400
Fair value, measurements, recurring | Corporate notes | Level 1 |  |
Assets: |  |
Available-for-sale debt securities: | 0 | 0
Fair value, measurements, recurring | Corporate notes | Level 2 |  |
Assets: |  |
Available-for-sale debt securities: | 544 | 1,400
Fair value, measurements, recurring | U.S. agency securities |  |
Assets: |  |
Available-for-sale debt securities: | 40 | 70
Fair value, measurements, recurring | U.S. agency securities | Level 1 |  |
Assets: |  |
Available-for-sale debt securities: | 0 | 0
Fair value, measurements, recurring | U.S. agency securities | Level 2 |  |
Assets: |  |
Available-for-sale debt securities: | $ 40 | $ 70

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