Fair Value Measurements - Schedule of financial assets and liabilities measured at fair value (Details) - USD ($) $ in Millions	Jul. 31, 2022	Jul. 31, 2021
Assets:
Cash equivalents, primarily money market funds and time deposits	$ 2,796	$ 2,562
Available-for-sale debt securities:
Total available-for-sale debt securities	685	1,508
Liabilities:
Carrying value	6,914	2,034
Municipal bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	0	38
Corporate notes
Available-for-sale debt securities:
Total available-for-sale debt securities	589	1,400
U.S. agency securities
Available-for-sale debt securities:
Total available-for-sale debt securities	96	70
Fair Value, Measurements, Recurring
Assets:
Cash equivalents, primarily money market funds and time deposits	1,835	1,660
Available-for-sale debt securities:
Total available-for-sale debt securities	685	1,508
Total assets measured at fair value on a recurring basis	2,520	3,168
Fair Value, Measurements, Recurring \| Municipal bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	0	38
Fair Value, Measurements, Recurring \| Corporate notes
Available-for-sale debt securities:
Total available-for-sale debt securities	589	1,400
Fair Value, Measurements, Recurring \| U.S. agency securities
Available-for-sale debt securities:
Total available-for-sale debt securities	96	70
Fair Value, Measurements, Recurring \| Level 1
Assets:
Cash equivalents, primarily money market funds and time deposits	1,835	1,660
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
Total assets measured at fair value on a recurring basis	1,835	1,660
Fair Value, Measurements, Recurring \| Level 1 \| Municipal bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
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 and time deposits	0	0
Available-for-sale debt securities:
Total available-for-sale debt securities	685	1,508
Total assets measured at fair value on a recurring basis	685	1,508
Fair Value, Measurements, Recurring \| Level 2 \| Municipal bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	0	38
Fair Value, Measurements, Recurring \| Level 2 \| Corporate notes
Available-for-sale debt securities:
Total available-for-sale debt securities	589	1,400
Fair Value, Measurements, Recurring \| Level 2 \| U.S. agency securities
Available-for-sale debt securities:
Total available-for-sale debt securities	96	70
Senior Unsecured Notes
Liabilities:
Carrying value	1,990	1,990
Senior Unsecured Notes \| Fair Value, Measurements, Recurring
Liabilities:
Senior unsecured notes	1,838	1,986
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	$ 1,838	$ 1,986

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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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- Definition

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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