Financial Instruments - Non-Marketable Equity Securities (Details) - USD ($) $ in Millions	6 Months Ended
Jul. 31, 2023	Jul. 31, 2022
Equity Securities without Readily Determinable Fair Value, Annual Amount [Abstract]
Upward adjustments	$ 0	$ 1
Negative adjustments, including impairments	(11)	(5)
Net unrealized adjustments	(11)	$ (4)
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Cumulative Amount [Abstract]
Upward adjustments	29
Negative adjustments, including impairments	(97)
Net unrealized adjustments	$ (68)

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479536/321-10-50-3

+ Details

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- Definition

Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value.

+ References

+ Details

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- Definition

Amount of impairment loss on investment in equity security without readily determinable fair value.

+ References

+ Details

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- Definition

Amount of cumulative impairment loss on investment in equity security without readily determinable fair value.

+ References

+ Details

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- References

No definition available.

+ Details

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- Definition

Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479536/321-10-50-3

+ Details

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- Definition

Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value.

+ References

+ Details

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