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Fair Value Measurements - Schedule of cash equivalents and available-for-sale debt securities by balance sheet classification (Details) - USD ($) $ in Millions | Jul. 31, 2020 | Jul. 31, 2019
--- | --- | ---
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | $ 808 | $ 824
Level 3 |  |
Available-for-sale debt securities: |  |
Loans held-for-sale | 98 |
In cash and cash equivalents |  |
Cash equivalents: |  |
Total cash and cash equivalents | 6,442 | 2,116
Fair Value, Measurements, Recurring |  |
Cash equivalents: |  |
Total cash and cash equivalents | 5,765 | 1,647
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | 808 | 824
Fair Value, Measurements, Recurring | Level 1 |  |
Cash equivalents: |  |
Total cash and cash equivalents | 5,765 | 1,647
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Cash equivalents: |  |
Total cash and cash equivalents | 0 | 0
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | 808 | 824
Fair Value, Measurements, Recurring | In cash and cash equivalents |  |
Cash equivalents: |  |
Total cash and cash equivalents | 5,765 | 1,647
Fair Value, Measurements, Recurring | In cash and cash equivalents | Level 1 |  |
Cash equivalents: |  |
Total cash and cash equivalents | 5,765 | 1,647
Fair Value, Measurements, Recurring | In cash and cash equivalents | Level 2 |  |
Cash equivalents: |  |
Total cash and cash equivalents | 0 | 0
Fair Value, Measurements, Recurring | In investments |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | 608 | 624
Fair Value, Measurements, Recurring | In investments | Level 1 |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | In investments | Level 2 |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | 608 | 624
Fair Value, Measurements, Recurring | In funds held for customers |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | 200 | 200
Fair Value, Measurements, Recurring | In funds held for customers | Level 1 |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | 0 | 0
Fair Value, Measurements, Recurring | In funds held for customers | Level 2 |  |
Available-for-sale debt securities: |  |
Total available-for-sale debt securities | $ 200 | $ 200

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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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: 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=121558606&loc=SL82898722-210454 Reference 3: 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=121553693&loc=d3e26610-111562 Reference 4: 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=121645371&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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