Financial Instruments - Schedule of Non-Marketable Equity Securities (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Apr. 30, 2026 |
Apr. 30, 2025 |
|
| Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract] | ||
| Upward adjustments | $ 60 | $ 0 |
| Negative adjustments, including impairments | (1) | 0 |
| Net unrealized adjustments | 59 | $ 0 |
| Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount [Abstract] | ||
| Upward adjustments | 89 | |
| Negative adjustments, including impairments | (141) | |
| Net unrealized adjustments | $ (52) | |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- 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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| X | ||||||||||
- 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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| X | ||||||||||
- 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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| X | ||||||||||
- 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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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- 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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