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Available-for-Sale Debt and Equity Investments (Tables) | 3 Months Ended
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Oct. 29, 2022
Investments, Debt and Equity Securities [Abstract] |
Summary of Available-for-Sale Debt Investments | The following tables summarize our available-for-sale debt investments (in millions):
October 29, 2022 | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized and Credit Losses |  | Fair Value
U.S. government securities | $ | 1,545 |  |  | $ | — |  |  | $ | (70) |  |  | $ | 1,475 |
U.S. government agency securities | 171 |  |  | — |  |  | (6) |  |  | 165 |
Non-U.S. government and agency securities | 275 |  |  | — |  |  | (1) |  |  | 274 |
Corporate debt securities | 7,808 |  |  | — |  |  | (492) |  |  | 7,316 |
U.S. agency mortgage-backed securities | 2,071 |  |  | — |  |  | (273) |  |  | 1,798 |
Commercial paper | 798 |  |  | — |  |  | — |  |  | 798 |
Certificates of deposit | 421 |  |  | — |  |  | — |  |  | 421 |
Total | $ | 13,089 |  |  | $ | — |  |  | $ | (842) |  |  | $ | 12,247 |
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 |
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):
| Three Months Ended
| October 29, 2022 |  | October 30, 2021
Gross realized gains | $ | — |  |  | $ | 6 |
Gross realized losses | (6) |  |  | — |
Total | $ | (6) |  |  | $ | 6 |
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 October 29, 2022 and July 30, 2022 (in millions):
| UNREALIZED LOSSES LESS THAN 12 MONTHS |  | UNREALIZED LOSSES 12 MONTHS OR GREATER |  | TOTAL
October 29, 2022 | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. government securities | $ | 530 |  |  | $ | (12) |  |  | $ | 944 |  |  | $ | (58) |  |  | $ | 1,474 |  |  | $ | (70) |
U.S. government agency securities | 101 |  |  | (2) |  |  | 64 |  |  | (4) |  |  | 165 |  |  | (6) |
Non-U.S. government and agency securities | 257 |  |  | (1) |  |  | — |  |  | — |  |  | 257 |  |  | (1) |
Corporate debt securities | 5,065 |  |  | (252) |  |  | 2,090 |  |  | (206) |  |  | 7,155 |  |  | (458) |
U.S. agency mortgage-backed securities | 651 |  |  | (76) |  |  | 1,136 |  |  | (197) |  |  | 1,787 |  |  | (273) |
Commercial paper | 45 |  |  | — |  |  | — |  |  | — |  |  | 45 |  |  | — |
Total | $ | 6,649 |  |  | $ | (343) |  |  | $ | 4,234 |  |  | $ | (465) |  |  | $ | 10,883 |  |  | $ | (808) |
| 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) |
Maturities of Available-for-Sale Debt Investments | The following table summarizes the maturities of our available-for-sale debt investments as of October 29, 2022 (in millions):
| Amortized Cost |  | Fair Value
Within 1 year | $ | 4,483 |  |  | $ | 4,399 |
After 1 year through 5 years | 6,478 |  |  | 6,002 |
After 5 years through 10 years | 56 |  |  | 47 |
After 10 years | 1 |  |  | 1 |
Mortgage-backed securities with no single maturity | 2,071 |  |  | 1,798 |
Total | $ | 13,089 |  |  | $ | 12,247 |

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