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Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Oct. 31, 2022 | Jan. 31, 2022
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Debt Securities, Trading and Available-for-sale [Abstract] |  |
Amortized Cost | $ 1,106 | $ 779
Gross unrealized gains | 6 | 20
Gross unrealized losses | (4) | (1)
Fair value | 1,108 | 798
Money market funds | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 515 | 302
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 515 | 302
Commercial paper | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 299 | 55
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 299 | 55
Commercial paper | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 87 | 103
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 87 | 103
Certificates of deposit | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 21 | 6
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 21 | 6
Certificates of deposit | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost |  | 14
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Convertible debt securities (6) |  | 14
Agency discount notes | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 7 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Convertible debt securities (6) | 7 |
Other | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 5 | 4
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 5 | 4
Other | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 8 | 4
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 10 | 4
Other | Long-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 5 | 1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 5 | 1
U.S. government securities | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost |  | 25
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Convertible debt securities (6) |  | 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 (6) |  | 13
Custody cash deposit | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost |  | 18
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Convertible debt securities (6) |  | 18
Corporate debt securities | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost |  | 18
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Convertible debt securities (6) |  | 18
Corporate debt securities | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 35 | 61
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 35 | 61
Corporate debt securities | Long-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 27 | 44
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | 0
Convertible debt securities (6) | 26 | 44
Asset-backed securities | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 7 | 26
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Convertible debt securities (6) | 7 | 26
Asset-backed securities | Long-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 6 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Convertible debt securities (6) | 6 |
Municipal bonds | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost |  | 11
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Convertible debt securities (6) |  | 11
Common stock | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost |  | 0
Gross Unrealized Gains |  | 4
Gross Unrealized Losses |  | 0
Convertible debt securities (6) |  | 4
Mutual funds |  |
Debt Securities, Trading and Available-for-sale [Abstract] |  |
Amortized Cost | 81 | 74
Gross Unrealized Gains | 4 | 16
Gross Unrealized Losses | (3) | (1)
Fair Value | 82 | $ 89
Convertible debt securities |  |
Marketable securities: |  |
Amortized Cost | 3 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Convertible debt securities (6) | 3 |
Debt Securities, Trading and Available-for-sale [Abstract] |  |
Fair Value | $ 3 |

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