Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Millions	Oct. 31, 2022	Jul. 31, 2022
Assets:
Cash equivalents, primarily money market funds and time deposits	$ 2,125	$ 2,796
Available-for-sale debt securities, fair value	799	685
Long-term debt	6,985	6,914
Senior Unsecured Notes
Assets:
Long-term debt	1,990	1,990
Fair value, measurements, recurring
Assets:
Cash equivalents, primarily money market funds and time deposits	1,117	1,835
Available-for-sale debt securities, fair value	799	685
Total assets measured at fair value on a recurring basis	1,916	2,520
Fair value, measurements, recurring \| Senior Unsecured Notes
Assets:
Senior unsecured notes	1,745	1,838
Fair value, measurements, recurring \| Level 1
Assets:
Cash equivalents, primarily money market funds and time deposits	1,117	1,835
Available-for-sale debt securities, fair value	0	0
Total assets measured at fair value on a recurring basis	1,117	1,835
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 and time deposits	0	0
Available-for-sale debt securities, fair value	799	685
Total assets measured at fair value on a recurring basis	799	685
Fair value, measurements, recurring \| Level 2 \| Senior Unsecured Notes
Assets:
Senior unsecured notes	1,745	1,838
Fair value, measurements, recurring \| Municipal bonds
Assets:
Available-for-sale debt securities, fair value	0	0
Fair value, measurements, recurring \| Municipal bonds \| Level 1
Assets:
Available-for-sale debt securities, fair value	0	0
Fair value, measurements, recurring \| Municipal bonds \| Level 2
Assets:
Available-for-sale debt securities, fair value	0	0
Fair value, measurements, recurring \| Corporate notes
Assets:
Available-for-sale debt securities, fair value	684	589
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	684	589
Fair value, measurements, recurring \| U.S. agency securities
Assets:
Available-for-sale debt securities, fair value	115	96
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	$ 115	$ 96

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

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