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Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Jan. 31, 2026	Jul. 31, 2025
Assets:
Cash equivalents, primarily money market funds	$ 2,942	$ 2,884
Available-for-sale debt securities, fair value	183	1,818
Fair value, measurements, recurring
Assets:
Cash equivalents, primarily money market funds	318	1,790
Available-for-sale debt securities, fair value	183	1,818
Total assets measured at fair value on a recurring basis	501	3,608
Fair value, measurements, recurring | Level 1
Assets:
Cash equivalents, primarily money market funds	318	1,790
Available-for-sale debt securities, fair value	0	0
Total assets measured at fair value on a recurring basis	318	1,790
Fair value, measurements, recurring | Level 2
Assets:
Cash equivalents, primarily money market funds	0	0
Available-for-sale debt securities, fair value	183	1,818
Total assets measured at fair value on a recurring basis	183	1,818
Fair value, measurements, recurring | Corporate notes
Assets:
Available-for-sale debt securities, fair value	178	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	178	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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Fair value portion of asset recognized for present right to economic benefit.

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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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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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