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Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Millions | Jan. 31, 2020 | Jul. 31, 2019
--- | --- | ---
Assets: |  |
Cash equivalents, primarily time deposits, savings deposit accounts, and money market funds | $ 1,641 | $ 2,116
Available-for-sale debt securities | 825 | 824
Fair value, measurements, recurring |  |
Assets: |  |
Cash equivalents, primarily time deposits, savings deposit accounts, and money market funds | 1,222 | 1,647
Available-for-sale debt securities | 825 | 824
Total assets measured at fair value on a recurring basis | 2,047 | 2,471
Fair value, measurements, recurring | Level 1 |  |
Assets: |  |
Cash equivalents, primarily time deposits, savings deposit accounts, and money market funds | 1,222 | 1,647
Available-for-sale debt securities | 0 | 0
Total assets measured at fair value on a recurring basis | 1,222 | 1,647
Fair value, measurements, recurring | Level 2 |  |
Assets: |  |
Cash equivalents, primarily time deposits, savings deposit accounts, and money market funds | 0 | 0
Available-for-sale debt securities | 825 | 824
Total assets measured at fair value on a recurring basis | 825 | 824
Fair value, measurements, recurring | Municipal bonds |  |
Assets: |  |
Available-for-sale debt securities | 1 | 5
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 | 1 | 5
Fair value, measurements, recurring | Corporate notes |  |
Assets: |  |
Available-for-sale debt securities | 794 | 800
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 | 794 | 800
Fair value, measurements, recurring | U.S. agency securities |  |
Assets: |  |
Available-for-sale debt securities | 30 | 19
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 | $ 30 | $ 19

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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