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Investments - Summary of Available-for-Sale Debt Investments (Details) - USD ($) $ in Millions | Jan. 27, 2024 | Jul. 29, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 11,962 | $ 16,199
Gross Unrealized Gains | 11 | 18
Gross Unrealized and Credit Losses | (443) | (625)
Fair Value | 11,530 | 15,592
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,428 | 3,587
Gross Unrealized Gains | 3 | 1
Gross Unrealized and Credit Losses | (34) | (62)
Fair Value | 2,397 | 3,526
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 354 | 428
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | (2) | (5)
Fair Value | 352 | 423
Non-U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 364 | 364
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 | (1)
Fair Value | 364 | 363
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 5,343 | 7,238
Gross Unrealized Gains | 7 | 3
Gross Unrealized and Credit Losses | (210) | (327)
Fair Value | 5,140 | 6,914
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,127 | 2,421
Gross Unrealized Gains | 1 | 14
Gross Unrealized and Credit Losses | (197) | (230)
Fair Value | 1,931 | 2,205
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 828 | 1,484
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 | 0
Fair Value | 828 | 1,484
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 518 | 677
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 | 0
Fair Value | $ 518 | $ 677

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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