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Available-for-Sale Debt and Equity Investments - Summary of Available-for-Sale Debt Investments (Details) - USD ($) $ in Millions | Jan. 23, 2021 | Jul. 25, 2020
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 18,426 | $ 17,163
Gross Unrealized Gains | 393 | 454
Gross Unrealized and Credit Losses | (29) |
Gross Unrealized Losses |  | (7)
Fair Value | 18,790 | 17,610
Net unsettled investment sales | 39 |
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,613 | 2,614
Gross Unrealized Gains | 50 | 71
Gross Unrealized and Credit Losses | 0 |
Gross Unrealized Losses |  | 0
Fair Value | 2,663 | 2,685
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 168 | 110
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 |
Gross Unrealized Losses |  | 0
Fair Value | 168 | 110
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,516 | 11,549
Gross Unrealized Gains | 296 | 334
Gross Unrealized and Credit Losses | (26) |
Gross Unrealized Losses |  | (6)
Fair Value | 10,786 | 11,877
U.S. agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,796 | 1,987
Gross Unrealized Gains | 47 | 49
Gross Unrealized and Credit Losses | (3) |
Gross Unrealized Losses |  | (1)
Fair Value | 2,840 | 2,035
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,730 | 727
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 |
Gross Unrealized Losses |  | 0
Fair Value | 1,730 | 727
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 603 | 176
Gross Unrealized Gains | 0 | 0
Gross Unrealized and Credit Losses | 0 |
Gross Unrealized Losses |  | 0
Fair Value | $ 603 | $ 176

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