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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions | Oct. 31, 2025 | Jul. 31, 2025
--- | --- | ---
Assets: |  |
Cash equivalents, primarily money market funds | $ 3,506 | $ 2,884
Available-for-sale debt securities, fair value | 340 | 1,818
Fair value, measurements, recurring |  |
Assets: |  |
Cash equivalents, primarily money market funds | 2,330 | 1,790
Available-for-sale debt securities, fair value | 340 | 1,818
Total assets measured at fair value on a recurring basis | 2,670 | 3,608
Fair value, measurements, recurring | Level 1 |  |
Assets: |  |
Cash equivalents, primarily money market funds | 2,330 | 1,790
Available-for-sale debt securities, fair value | 0 | 0
Total assets measured at fair value on a recurring basis | 2,330 | 1,790
Fair value, measurements, recurring | Level 2 |  |
Assets: |  |
Cash equivalents, primarily money market funds | 0 | 0
Available-for-sale debt securities, fair value | 340 | 1,818
Total assets measured at fair value on a recurring basis | 340 | 1,818
Fair value, measurements, recurring | Corporate notes |  |
Assets: |  |
Available-for-sale debt securities, fair value | 335 | 502
Fair value, measurements, recurring | Corporate notes | Level 1 |  |
Assets: |  |
Available-for-sale debt securities, fair value | 0 | 0
Fair value, measurements, recurring | Corporate notes | Level 2 |  |
Assets: |  |
Available-for-sale debt securities, fair value | 335 | 502
Fair value, measurements, recurring | U.S. agency securities |  |
Assets: |  |
Available-for-sale debt securities, fair value | 5 | 1,316
Fair value, measurements, recurring | U.S. agency securities | Level 1 |  |
Assets: |  |
Available-for-sale debt securities, fair value | 0 | 0
Fair value, measurements, recurring | U.S. agency securities | Level 2 |  |
Assets: |  |
Available-for-sale debt securities, fair value | $ 5 | $ 1,316

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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