Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Millions	Apr. 30, 2024	Jul. 31, 2023
Assets:
Cash equivalents, primarily money market funds	$ 4,215	$ 2,848
Available-for-sale debt securities, fair value	613	1,014
Long-term debt	5,952	6,120
Senior unsecured notes
Assets:
Long-term debt	5,450	1,490
Fair value, measurements, recurring
Assets:
Cash equivalents, primarily money market funds	3,174	1,888
Available-for-sale debt securities, fair value	613	1,014
Total assets measured at fair value on a recurring basis	3,787	2,902
Fair value, measurements, recurring \| Senior unsecured notes
Assets:
Senior unsecured notes	5,286	1,309
Fair value, measurements, recurring \| Level 1
Assets:
Cash equivalents, primarily money market funds	3,174	1,888
Available-for-sale debt securities, fair value	0	0
Total assets measured at fair value on a recurring basis	3,174	1,888
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	0	0
Available-for-sale debt securities, fair value	613	1,014
Total assets measured at fair value on a recurring basis	613	1,014
Fair value, measurements, recurring \| Level 2 \| Senior unsecured notes
Assets:
Senior unsecured notes	5,286	1,309
Fair value, measurements, recurring \| Corporate notes
Assets:
Available-for-sale debt securities, fair value	470	805
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	470	805
Fair value, measurements, recurring \| U.S. agency securities
Assets:
Available-for-sale debt securities, fair value	143	209
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	$ 143	$ 209

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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