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Cash and Cash Equivalents, Investments, and Funds Held for Customers - Classification on Balance Sheets (Details) - USD ($) $ in Millions | Apr. 30, 2021 | Jul. 31, 2020 | Apr. 30, 2020
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Cash and Cash Equivalents Items [Line Items] |  |  |
Cash and cash equivalents | $ 3,164 | $ 6,442 | $ 3,371
Available-for-sale debt securities, amortized cost | 1,147 | 800 |
Total cash and cash equivalents, investments, and funds held for customers, amortized cost | 4,459 | 7,497 |
Cash equivalents: | 3,164 | 6,442 |
Available-for-sale debt securities, fair value | 1,152 | 808 |
Total cash and cash equivalents, investments, and funds held for customers, fair value | 4,464 | 7,505 |
Investments |  |  |
Cash and Cash Equivalents Items [Line Items] |  |  |
Available-for-sale debt securities, amortized cost | 948 | 600 |
Available-for-sale debt securities, fair value | 952 | 608 |
Funds held for customers |  |  |
Cash and Cash Equivalents Items [Line Items] |  |  |
Available-for-sale debt securities, amortized cost | 347 | 455 |
Available-for-sale debt securities, fair value | $ 348 | $ 455 |

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- Definition Amortized cost 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 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 + Details
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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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