| Schedule of cash equivalents and marketable securities |
The following is a summary of cash equivalents and marketable securities: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | April 30, 2023 | | Amortized
Cost | | Unrealized
Gain | | Unrealized
Loss | | Estimated
Fair Value | | Reported as | | | | | | | Cash Equivalents | | Marketable Securities | | | | | | | | | | | | | | | (In millions) | | Corporate debt securities | $ | 6,723 | | | $ | 4 | | | $ | (11) | | | $ | 6,716 | | | $ | 2,535 | | | $ | 4,181 | | | Debt securities issued by the U.S. Treasury | 3,996 | | | 2 | | | (31) | | | 3,967 | | | 421 | | | 3,546 | | | Debt securities issued by U.S. government agencies | 2,442 | | | 1 | | | (1) | | | 2,442 | | | 199 | | | 2,243 | | | Money market funds | 1,502 | | | — | | | — | | | 1,502 | | | 1,502 | | | — | | | Certificates of deposit | 395 | | | — | | | — | | | 395 | | | 173 | | | 222 | | | Foreign government bonds | 49 | | | — | | | — | | | 49 | | | — | | | 49 | | | | | | | | | | | | | | | | | | | | | | | | | | | Total | $ | 15,107 | | | $ | 7 | | | $ | (43) | | | $ | 15,071 | | | $ | 4,830 | | | $ | 10,241 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | January 29, 2023 | | Amortized
Cost | | Unrealized
Gain | | Unrealized
Loss | | Estimated
Fair Value | | Reported as | | | | | | | Cash Equivalents | | Marketable Securities | | | | | | | | | | | | | | | (In millions) | | Corporate debt securities | $ | 4,809 | | | $ | — | | | $ | (12) | | | $ | 4,797 | | | $ | 1,087 | | | $ | 3,710 | | | Debt securities issued by the U.S. Treasury | 4,185 | | | 1 | | | (44) | | | 4,142 | | | — | | | 4,142 | | | Debt securities issued by U.S. government agencies | 1,836 | | | — | | | (2) | | | 1,834 | | | 50 | | | 1,784 | | | Money market funds | 1,777 | | | — | | | — | | | 1,777 | | | 1,777 | | | — | | | Certificates of deposit | 365 | | | — | | | — | | | 365 | | | 134 | | | 231 | | | Foreign government bonds | 140 | | | — | | | — | | | 140 | | | 100 | | | 40 | | | | | | | | | | | | | | | | | | | | | | | | | | | Total | $ | 13,112 | | | $ | 1 | | | $ | (58) | | | $ | 13,055 | | | $ | 3,148 | | | $ | 9,907 | |
The amortized cost and estimated fair value of cash equivalents and marketable securities are shown below by contractual maturity. | | | | | | | | | | | | | | | | | | | | | | | | | April 30, 2023 | | January 29, 2023 | | Amortized Cost | | Estimated Fair Value | | Amortized Cost | | Estimated Fair Value | | | | | | | | | | (In millions) | | Less than one year | $ | 12,654 | | | $ | 12,625 | | | $ | 9,738 | | | $ | 9,708 | | | Due in 1 - 5 years | 2,453 | | | 2,446 | | | 3,374 | | | 3,347 | | | | | | | | | | | Total | $ | 15,107 | | | $ | 15,071 | | | $ | 13,112 | | | $ | 13,055 | |
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| Schedule of investments in a continuous unrealized loss position |
The following tables provide the breakdown of unrealized losses, aggregated by investment category and length of time that individual securities have been in a continuous loss position: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | April 30, 2023 | | | Less than 12 Months | | 12 Months or Greater | | Total | | | Estimated Fair Value | | Gross Unrealized Loss | | Estimated Fair Value | | Gross Unrealized Loss | | Estimated Fair Value | | Gross Unrealized Loss | | | | | | | | | | | | | | | (In millions) | | Debt securities issued by the U.S. Treasury | $ | 1,601 | | | $ | (11) | | | $ | 1,106 | | | $ | (20) | | | $ | 2,707 | | | $ | (31) | | | Debt securities issued by U.S. government agencies | 1,259 | | | (1) | | | — | | | — | | | 1,259 | | | (1) | | | Corporate debt securities | 945 | | | (4) | | | 838 | | | (7) | | | 1,783 | | | (11) | | | Total | $ | 3,805 | | | $ | (16) | | | $ | 1,944 | | | $ | (27) | | | $ | 5,749 | | | $ | (43) | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | January 29, 2023 | | | Less than 12 Months | | 12 Months or Greater | | Total | | | Estimated Fair Value | | Gross Unrealized Loss | | Estimated Fair Value | | Gross Unrealized Loss | | Estimated Fair Value | | Gross Unrealized Loss | | | | | | | | | | | | | | | (In millions) | | Debt securities issued by the U.S. Treasury | $ | 2,444 | | | $ | (21) | | | $ | 1,172 | | | $ | (23) | | | $ | 3,616 | | | $ | (44) | | | Corporate debt securities | 1,188 | | | (7) | | | 696 | | | (5) | | | 1,884 | | | (12) | | | Debt securities issued by U.S. government agencies | 1,307 | | | (2) | | | — | | | — | | | 1,307 | | | (2) | | | Total | $ | 4,939 | | | $ | (30) | | | $ | 1,868 | | | $ | (28) | | | $ | 6,807 | | | $ | (58) | |
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