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Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Apr. 30, 2022 | Jan. 31, 2022 | Jan. 31, 2021
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Debt Securities, Trading and Available-for-sale [Abstract] |  |  |
Amortized Cost | $ 869 | $ 779 |
Gross unrealized gains | 10 | 20 |
Gross unrealized losses | (1) | (1) |
Fair value | 878 | 798 |
Money market funds | Cash and Cash Equivalents |  |  |
Marketable securities: |  |  |
Amortized Cost | 531 | 302 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 531 | 302 |
Commercial paper | Cash and Cash Equivalents |  |  |
Marketable securities: |  |  |
Amortized Cost | 117 | 55 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 117 | 55 |
Commercial paper | Short-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost | 6 | 103 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 6 | 103 |
U.S. government securities | Cash and Cash Equivalents |  |  |
Marketable securities: |  |  |
Amortized Cost | 20 | 25 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 20 | 25 |
U.S. government securities | Short-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost |  | 13 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | 0 |
Convertible debt securities |  | 13 |
Agency discount notes | Cash and Cash Equivalents |  |  |
Marketable securities: |  |  |
Amortized Cost | 8 | 18 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 8 | 18 |
Other | Cash and Cash Equivalents |  |  |
Marketable securities: |  |  |
Amortized Cost | 8 | 4 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 8 | 4 |
Other | Short-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost | 1 | 4 |
Gross Unrealized Gains | 2 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 3 | 4 |
Other | Long-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost |  | 1 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | 0 |
Convertible debt securities |  | 1 |
Corporate debt securities | Cash and Cash Equivalents |  |  |
Marketable securities: |  |  |
Amortized Cost |  | 18 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | 0 |
Convertible debt securities |  | 18 |
Corporate debt securities | Short-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost | 28 | 61 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 28 | 61 |
Corporate debt securities | Long-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost | 39 | 44 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 39 | 44 |
Asset backed securities | Short-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost | 20 | 26 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 20 | 26 |
Certificates of deposit | Cash and Cash Equivalents |  |  |
Marketable securities: |  |  |
Amortized Cost |  | 6 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | 0 |
Convertible debt securities |  | 6 |
Certificates of deposit | Short-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost | 10 | 14 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Convertible debt securities | 10 | 14 |
Mutual funds |  |  |
Debt Securities, Trading and Available-for-sale [Abstract] |  |  |
Amortized Cost | 78 | 74 |
Gross Unrealized Gains | 8 | 16 |
Gross Unrealized Losses | (1) | (1) |
Fair Value | 85 | 89 | $ 89
Convertible debt securities |  |  |
Marketable securities: |  |  |
Amortized Cost | 3 |  |
Gross Unrealized Gains | 0 |  |
Gross Unrealized Losses | 0 |  |
Convertible debt securities | 3 |  |
Debt Securities, Trading and Available-for-sale [Abstract] |  |  |
Fair Value | $ 3 |  |
Municipal bonds | Short-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost |  | 11 |
Gross Unrealized Gains |  | 0 |
Gross Unrealized Losses |  | 0 |
Convertible debt securities |  | 11 |
Common stock | Short-term Marketable Securities |  |  |
Marketable securities: |  |  |
Amortized Cost |  | 0 |
Gross Unrealized Gains |  | 4 |
Gross Unrealized Losses |  | 0 |
Convertible debt securities |  | $ 4 |

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