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Available-for-Sale Debt and Equity Investments - Summary of Available-for-Sale Debt Investments (Details) - USD ($) $ in Millions	Oct. 30, 2021	Jul. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 15,401	$ 14,978
Gross Unrealized Gains	192	268
Gross Unrealized and Credit Losses	(80)	(40)
Fair Value	15,513	15,206
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,032	1,773
Gross Unrealized Gains	12	21
Gross Unrealized and Credit Losses	(9)	0
Fair Value	2,035	1,794
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	142	152
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0	0
Fair Value	142	152
Non-U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3
Gross Unrealized Gains		0
Gross Unrealized and Credit Losses		0
Fair Value		3
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	9,114	8,727
Gross Unrealized Gains	156	213
Gross Unrealized and Credit Losses	(50)	(30)
Fair Value	9,220	8,910
U.S. agency mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,790	2,838
Gross Unrealized Gains	24	34
Gross Unrealized and Credit Losses	(21)	(10)
Fair Value	2,793	2,862
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,054	1,190
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0	0
Fair Value	1,054	1,190
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	269	295
Gross Unrealized Gains	0	0
Gross Unrealized and Credit Losses	0	0
Fair Value	$ 269	$ 295

X

- Definition

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax And Allowance For Credit Loss

+ References

No definition available.

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

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- Definition

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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 326
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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