Fair Value Measurements - Schedule of financial assets and liabilities measured at fair value (Details) - USD ($) $ in Millions	Jul. 31, 2023	Jul. 31, 2022
Assets:
Cash equivalents, primarily money market funds	$ 2,848	$ 2,796
Liabilities:
Carrying value	6,120	6,914
Fair Value, Measurements, Recurring
Assets:
Cash equivalents, primarily money market funds	1,888	1,835
Available-for-sale debt securities:
Total available-for-sale debt securities	1,014	685
Total assets measured at fair value on a recurring basis	2,902	2,520
Fair Value, Measurements, Recurring \| Corporate notes
Available-for-sale debt securities:
Total available-for-sale debt securities	805	589
Fair Value, Measurements, Recurring \| U.S. agency securities
Available-for-sale debt securities:
Total available-for-sale debt securities	209	96
Fair Value, Measurements, Recurring \| Level 1
Assets:
Cash equivalents, primarily money market funds	1,888	1,835
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
Total assets measured at fair value on a recurring basis	1,888	1,835
Fair Value, Measurements, Recurring \| Level 1 \| Corporate notes
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
Fair Value, Measurements, Recurring \| Level 1 \| U.S. agency securities
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
Fair Value, Measurements, Recurring \| Level 2
Assets:
Cash equivalents, primarily money market funds	0	0
Available-for-sale debt securities:
Total available-for-sale debt securities	1,014	685
Total assets measured at fair value on a recurring basis	1,014	685
Fair Value, Measurements, Recurring \| Level 2 \| Corporate notes
Available-for-sale debt securities:
Total available-for-sale debt securities	805	589
Fair Value, Measurements, Recurring \| Level 2 \| U.S. agency securities
Available-for-sale debt securities:
Total available-for-sale debt securities	209	96
Senior Unsecured Notes
Liabilities:
Carrying value	1,490	1,990
Senior Unsecured Notes \| Fair Value, Measurements, Recurring
Liabilities:
Senior unsecured notes	1,309	1,838
Senior Unsecured Notes \| Fair Value, Measurements, Recurring \| Level 1
Liabilities:
Senior unsecured notes	0	0
Senior Unsecured Notes \| Fair Value, Measurements, Recurring \| Level 2
Liabilities:
Senior unsecured notes	$ 1,309	$ 1,838

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

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