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Available-for-Sale Debt and Equity Investments - Summary of Available-for-Sale Debt Investments (Details) - USD ($) $ in Millions | Jan. 29, 2022 | Jul. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 14,244 | $ 14,978
Gross Unrealized Gains | 96 | 268
Gross Unrealized and Credit Losses | (179) | (40)
Fair Value | 14,161 | 15,206
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,702 | 1,773
Gross Unrealized Gains | 4 | 21
Gross Unrealized and Credit Losses | (19) | 0
Fair Value | 1,687 | 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 | (2) | 0
Fair Value | 140 | 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 | 9,008 | 8,727
Gross Unrealized Gains | 82 | 213
Gross Unrealized and Credit Losses | (102) | (30)
Fair Value | 8,988 | 8,910
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,569 | 2,838
Gross Unrealized Gains | 10 | 34
Gross Unrealized and Credit Losses | (56) | (10)
Fair Value | 2,523 | 2,862
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 614 | 1,190
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 | 0
Fair Value | 614 | 1,190
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 209 | 295
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 | 0
Fair Value | $ 209 | $ 295

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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 + Details
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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 + Details
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