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Financial Instruments - financial Instruments by Significant Investment Category (Details) - USD ($) $ in Millions | Jan. 31, 2023 | Jan. 31, 2022
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Debt Securities, Trading and Available-for-Sale [Abstract] |  |
Amortized cost | $ 1,279 | $ 779
Gross unrealized gains | 7 | 20
Gross unrealized losses | (5) | (1)
Fair value | 1,281 | 798
Money market funds | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 737 | 302
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 737 | 302
Commercial paper | Short-term |  |
Marketable securities: |  |
Fair Value | 42 | 103
Commercial paper | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 169 | 55
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 169 | 55
Commercial paper | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 42 | 103
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 42 | 103
Certificates of deposit | Short-term |  |
Marketable securities: |  |
Fair Value |  | 14
Certificates of deposit | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 35 | 6
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 35 | 6
Certificates of deposit | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost |  | 14
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 14
U.S. government securities | Short-term |  |
Marketable securities: |  |
Fair Value | 17 | 13
U.S. government securities | Long-term |  |
Marketable securities: |  |
Fair Value | 35 |
U.S. government securities | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 13 | 25
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 13 | 25
U.S. government securities | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost |  | 13
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 13
U.S. government securities | Short-term Marketable Securities | Short-term |  |
Marketable securities: |  |
Amortized Cost | 17 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 17 |
U.S. government securities | Long-term Marketable Securities | Long-term |  |
Marketable securities: |  |
Amortized Cost | 35 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 35 |
Other |  |
Marketable securities: |  |
Amortized Cost |  | 4
Gross Unrealized Gains |  |
Gross Unrealized Losses |  | 0
Fair Value |  | 4
Other | Short-term |  |
Marketable securities: |  |
Fair Value | 3 | 4
Other | Long-term |  |
Marketable securities: |  |
Fair Value | 9 | 1
Other | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost | 12 | 4
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 12 | 4
Other | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 3 |
Gross Unrealized Gains |  |
Gross Unrealized Losses | 0 |
Fair Value | 3 |
Other | Long-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 9 | 1
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 9 | 1
Custody cash deposit | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost |  | 18
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 18
Corporate debt securities | Short-term |  |
Marketable securities: |  |
Fair Value | 44 | 61
Corporate debt securities | Long-term |  |
Marketable securities: |  |
Fair Value | 45 | 44
Corporate debt securities | Cash and Cash Equivalents |  |
Marketable securities: |  |
Amortized Cost |  | 18
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 18
Corporate debt securities | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 44 | 61
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses |  |
Fair Value | 44 | 61
Corporate debt securities | Long-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 45 | 44
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 45 | 44
Asset backed securities | Short-term |  |
Marketable securities: |  |
Fair Value | 19 | 26
Asset backed securities | Long-term |  |
Marketable securities: |  |
Fair Value | 13 |
Asset backed securities | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 19 | 26
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 19 | 26
Asset backed securities | Long-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost | 13 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 13 |
Municipal bonds | Short-term |  |
Marketable securities: |  |
Fair Value |  | 11
Municipal bonds | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost |  | 11
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 11
Common Stock | Short-term |  |
Marketable securities: |  |
Fair Value |  | 4
Common Stock | Short-term Marketable Securities |  |
Marketable securities: |  |
Amortized Cost |  | 0
Gross Unrealized Gains |  | 4
Gross Unrealized Losses |  | 0
Fair Value |  | 4
Mutual funds |  |
Debt Securities, Trading and Available-for-Sale [Abstract] |  |
Amortized Cost | 81 | 74
Gross Unrealized Gains | 6 | 16
Gross Unrealized Losses | (1) | (1)
Fair Value | 86 | $ 89
Convertible debt securities |  |
Marketable securities: |  |
Amortized Cost | 3 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (2) |
Fair Value | 2 |
Debt Securities, Trading and Available-for-Sale [Abstract] |  |
Fair Value | 2 |
Strategic investments derivative asset |  |
Marketable securities: |  |
Amortized Cost | 2 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (2) |
Fair Value | $ 0 |

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