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Available-for-Sale Debt and Equity Investments (Tables) | 12 Months Ended
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Jul. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Summary of Available-for-Sale Investments | The following tables summarize our available-for-sale debt investments (in millions):
July 30, 2022 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized and Credit Losses |  | Fair Value
U.S. government securities | $ | 1,287 |  |  | $ | — |  |  | $ | (49) |  |  | $ | 1,238 |
U.S. government agency securities | 142 |  |  | — |  |  | (4) |  |  | 138 |
Non-U.S. government and agency securities | 272 |  |  | — |  |  | — |  |  | 272 |
Corporate debt securities | 8,127 |  |  | 2 |  |  | (311) |  |  | 7,818 |
U.S. agency mortgage-backed securities | 2,134 |  |  | — |  |  | (158) |  |  | 1,976 |
Commercial paper | 255 |  |  | — |  |  | — |  |  | 255 |
Certificates of deposit | 250 |  |  | — |  |  | — |  |  | 250 |
Total | $ | 12,467 |  |  | $ | 2 |  |  | $ | (522) |  |  | $ | 11,947 |
July 31, 2021 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized and Credit Losses |  | Fair Value
U.S. government securities | $ | 1,773 |  |  | $ | 21 |  |  | $ | — |  |  | $ | 1,794 |
U.S. government agency securities | 152 |  |  | — |  |  | — |  |  | 152 |
Non-U.S. government and agency securities | 3 |  |  | — |  |  | — |  |  | 3 |
Corporate debt securities | 8,727 |  |  | 213 |  |  | (30) |  |  | 8,910 |
U.S. agency mortgage-backed securities | 2,838 |  |  | 34 |  |  | (10) |  |  | 2,862 |
Commercial paper | 1,190 |  |  | — |  |  | — |  |  | 1,190 |
Certificates of deposit | 295 |  |  | — |  |  | — |  |  | 295 |
Total | $ | 14,978 |  |  | $ | 268 |  |  | $ | (40) |  |  | $ | 15,206 |
Gross Realized Gains and Gross Realized Losses Related to Available-for-Sale Investment | The following table presents the gross realized gains and gross realized losses related to available-for-sale debt investments (in millions):
Years Ended | July 30, 2022 |  | July 31, 2021 |  | July 25, 2020
Gross realized gains | $ | 27 |  |  | $ | 55 |  |  | $ | 70 |
Gross realized losses | (18) |  |  | (2) |  |  | (28) |
Total | $ | 9 |  |  | $ | 53 |  |  | $ | 42 |
Available-for-Sale Investments with Gross Unrealized Losses | The following tables present the breakdown of the available-for-sale debt investments with gross unrealized losses and the duration that those losses had been unrealized at July 30, 2022 and July 31, 2021 (in millions):
| UNREALIZED LOSSES LESS THAN 12 MONTHS |  | UNREALIZED LOSSES 12 MONTHS OR GREATER |  | TOTAL
July 30, 2022 | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. government securities | $ | 1,110 |  |  | $ | (44) |  |  | $ | 120 |  |  | $ | (5) |  |  | $ | 1,230 |  |  | $ | (49) |
U.S. government agency securities | 114 |  |  | (2) |  |  | 24 |  |  | (2) |  |  | 138 |  |  | (4) |
Non-U.S. government and agency securities | 264 |  |  | — |  |  | — |  |  | — |  |  | 264 |  |  | — |
Corporate debt securities | 6,920 |  |  | (240) |  |  | 422 |  |  | (37) |  |  | 7,342 |  |  | (277) |
U.S. agency mortgage-backed securities | 1,305 |  |  | (96) |  |  | 615 |  |  | (62) |  |  | 1,920 |  |  | (158) |
Total | $ | 9,713 |  |  | $ | (382) |  |  | $ | 1,181 |  |  | $ | (106) |  |  | $ | 10,894 |  |  | $ | (488) |
| UNREALIZED LOSSES LESS THAN 12 MONTHS |  | UNREALIZED LOSSES 12 MONTHS OR GREATER |  | TOTAL
July 31, 2021 | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. government securities | $ | 468 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 468 |  |  | $ | — |
U.S. government agency securities | 26 |  |  | — |  |  | — |  |  | — |  |  | 26 |  |  | — |
Corporate debt securities | 1,086 |  |  | (5) |  |  | 6 |  |  | — |  |  | 1,092 |  |  | (5) |
U.S. agency mortgage-backed securities | 1,293 |  |  | (10) |  |  | 13 |  |  | — |  |  | 1,306 |  |  | (10) |
Commercial paper | 37 |  |  | — |  |  | — |  |  | — |  |  | 37 |  |  | — |
Total | $ | 2,910 |  |  | $ | (15) |  |  | $ | 19 |  |  | $ | — |  |  | $ | 2,929 |  |  | $ | (15) |
Maturities of Fixed Income Securities | The following table summarizes the maturities of our available-for-sale debt investments as of July 30, 2022 (in millions):
| Amortized Cost |  | Fair Value
Within 1 year | $ | 3,273 |  |  | $ | 3,219 |
After 1 year through 5 years | 6,946 |  |  | 6,646 |
After 5 years through 10 years | 111 |  |  | 103 |
After 10 years | 3 |  |  | 3 |
Mortgage-backed securities with no single maturity | 2,134 |  |  | 1,976 |
Total | $ | 12,467 |  |  | $ | 11,947 |

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