Financial Instruments - Non-Marketable Equity Securities (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Oct. 31, 2022 |
Oct. 31, 2021 |
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| Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract] | ||
| Upward adjustments | $ 6 | $ 7 |
| Negative adjustments, including impairments | (5) | (10) |
| Net unrealized adjustments | 1 | $ (3) |
| Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount [Abstract] | ||
| Upward adjustments | 29 | |
| Negative adjustments, including impairments | (82) | |
| Net unrealized adjustments | $ (53) | |
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- References No definition available.
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- Definition Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of impairment loss on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cumulative impairment loss on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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