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Investments - Summary of Available-for-Sale Debt Investments (Details) - USD ($) $ in Millions | Jan. 25, 2025 | Jul. 27, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 8,186 | $ 10,212
Gross Unrealized Gains | 7 | 7
Gross Unrealized and Credit Losses | (235) | (354)
Fair Value | 7,958 | 9,865
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,177 | 2,380
Gross Unrealized Gains | 0 | 1
Gross Unrealized and Credit Losses | (29) | (28)
Fair Value | 2,148 | 2,353
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 112 | 223
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | (1) | (2)
Fair Value | 111 | 221
Non-U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 363 | 370
Gross Unrealized Gains | 1 | 1
Gross Unrealized and Credit Losses | 0 | 0
Fair Value | 364 | 371
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,292 | 3,818
Gross Unrealized Gains | 6 | 5
Gross Unrealized and Credit Losses | (94) | (146)
Fair Value | 3,204 | 3,677
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 847 | 1,959
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | (111) | (178)
Fair Value | 736 | 1,781
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 732 | 1,023
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 | 0
Fair Value | 732 | 1,023
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 663 | 439
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 | 0
Fair Value | $ 663 | $ 439

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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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