Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Apr. 30, 2022	Jul. 31, 2021
Assets:
Available-for-sale debt investments:	$ 12,914	$ 15,206
Marketable equity securities	242	137
U.S. government securities
Assets:
Available-for-sale debt investments:	1,300	1,794
U.S. government agency securities
Assets:
Available-for-sale debt investments:	146	152
Non-U.S. government and agency securities
Assets:
Available-for-sale debt investments:	171	3
Corporate debt securities
Assets:
Available-for-sale debt investments:	8,479	8,910
Commercial paper
Assets:
Available-for-sale debt investments:	548	1,190
Certificates of deposit
Assets:
Available-for-sale debt investments:	212	295
Fair value, measurements, recurring
Assets:
Marketable equity securities	242	137
Derivative assets	65	126
Total	17,484	22,327
Liabilities:
Derivative liabilities	87	20
Total	87	20
Fair value, measurements, recurring \| Money market funds
Assets:
Other assets:	750	750
Fair value, measurements, recurring \| U.S. government securities
Assets:
Available-for-sale debt investments:	1,300	1,794
Fair value, measurements, recurring \| U.S. government agency securities
Assets:
Available-for-sale debt investments:	146	152
Fair value, measurements, recurring \| Non-U.S. government and agency securities
Assets:
Available-for-sale debt investments:	171	3
Fair value, measurements, recurring \| Corporate debt securities
Assets:
Available-for-sale debt investments:	8,479	8,910
Fair value, measurements, recurring \| U.S. agency mortgage-backed securities
Assets:
Available-for-sale debt investments:	2,058	2,862
Fair value, measurements, recurring \| Commercial paper
Assets:
Available-for-sale debt investments:	548	1,190
Fair value, measurements, recurring \| Certificates of deposit
Assets:
Available-for-sale debt investments:	212	295
Fair value, measurements, recurring \| Money market funds
Assets:
Cash equivalents:	3,119	5,694
Fair value, measurements, recurring \| U.S. government securities
Assets:
Cash equivalents:	50	300
Fair value, measurements, recurring \| Non-U.S. government and agency securities
Assets:
Cash equivalents:	23	0
Fair value, measurements, recurring \| Corporate debt securities
Assets:
Cash equivalents:	43	0
Fair value, measurements, recurring \| Commercial paper
Assets:
Cash equivalents:	238	114
Fair value, measurements, recurring \| Certificates of deposit
Assets:
Cash equivalents:	40	0
Fair value, measurements, recurring \| Level 1
Assets:
Marketable equity securities	242	137
Derivative assets	0	0
Total	4,111	6,581
Liabilities:
Derivative liabilities	0	0
Total	0	0
Fair value, measurements, recurring \| Level 1 \| Money market funds
Assets:
Other assets:	750	750
Fair value, measurements, recurring \| Level 1 \| U.S. government securities
Assets:
Available-for-sale debt investments:	0	0
Fair value, measurements, recurring \| Level 1 \| U.S. government agency securities
Assets:
Available-for-sale debt investments:	0	0
Fair value, measurements, recurring \| Level 1 \| Non-U.S. government and agency securities
Assets:
Available-for-sale debt investments:	0	0
Fair value, measurements, recurring \| Level 1 \| Corporate debt securities
Assets:
Available-for-sale debt investments:	0	0
Fair value, measurements, recurring \| Level 1 \| U.S. agency mortgage-backed securities
Assets:
Available-for-sale debt investments:	0	0
Fair value, measurements, recurring \| Level 1 \| Commercial paper
Assets:
Available-for-sale debt investments:	0	0
Fair value, measurements, recurring \| Level 1 \| Certificates of deposit
Assets:
Available-for-sale debt investments:	0	0
Fair value, measurements, recurring \| Level 1 \| Money market funds
Assets:
Cash equivalents:	3,119	5,694
Fair value, measurements, recurring \| Level 1 \| U.S. government securities
Assets:
Cash equivalents:	0	0
Fair value, measurements, recurring \| Level 1 \| Non-U.S. government and agency securities
Assets:
Cash equivalents:	0	0
Fair value, measurements, recurring \| Level 1 \| Corporate debt securities
Assets:
Cash equivalents:	0	0
Fair value, measurements, recurring \| Level 1 \| Commercial paper
Assets:
Cash equivalents:	0	0
Fair value, measurements, recurring \| Level 1 \| Certificates of deposit
Assets:
Cash equivalents:	0	0
Fair value, measurements, recurring \| Level 2
Assets:
Marketable equity securities	0	0
Derivative assets	65	126
Total	13,373	15,746
Liabilities:
Derivative liabilities	87	20
Total	87	20
Fair value, measurements, recurring \| Level 2 \| Money market funds
Assets:
Other assets:	0	0
Fair value, measurements, recurring \| Level 2 \| U.S. government securities
Assets:
Available-for-sale debt investments:	1,300	1,794
Fair value, measurements, recurring \| Level 2 \| U.S. government agency securities
Assets:
Available-for-sale debt investments:	146	152
Fair value, measurements, recurring \| Level 2 \| Non-U.S. government and agency securities
Assets:
Available-for-sale debt investments:	171	3
Fair value, measurements, recurring \| Level 2 \| Corporate debt securities
Assets:
Available-for-sale debt investments:	8,479	8,910
Fair value, measurements, recurring \| Level 2 \| U.S. agency mortgage-backed securities
Assets:
Available-for-sale debt investments:	2,058	2,862
Fair value, measurements, recurring \| Level 2 \| Commercial paper
Assets:
Available-for-sale debt investments:	548	1,190
Fair value, measurements, recurring \| Level 2 \| Certificates of deposit
Assets:
Available-for-sale debt investments:	212	295
Fair value, measurements, recurring \| Level 2 \| Money market funds
Assets:
Cash equivalents:	0	0
Fair value, measurements, recurring \| Level 2 \| U.S. government securities
Assets:
Cash equivalents:	50	300
Fair value, measurements, recurring \| Level 2 \| Non-U.S. government and agency securities
Assets:
Cash equivalents:	23	0
Fair value, measurements, recurring \| Level 2 \| Corporate debt securities
Assets:
Cash equivalents:	43	0
Fair value, measurements, recurring \| Level 2 \| Commercial paper
Assets:
Cash equivalents:	238	114
Fair value, measurements, recurring \| Level 2 \| Certificates of deposit
Assets:
Cash equivalents:	$ 40	$ 0

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 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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of financial and nonfinancial obligations.

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