Shareholders' Equity - Schedule of Fair Value of Restricted Stock (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Restricted stock units
Additional information related to restricted stock and performance share awards and restricted stock units
Fair value	$ 1,345	$ 931	$ 703
Unrecognized compensation cost	$ 1,686	$ 1,323	$ 1,102
Weighted average remaining period to expense, (years)	10 months 24 days	1 year	1 year 2 months 12 days
Restricted stock and performance-based restricted stock units
Additional information related to restricted stock and performance share awards and restricted stock units
Fair value	$ 477	$ 390	$ 264
Unrecognized compensation cost	$ 656	$ 548	$ 417
Weighted average remaining period to expense, (years)	1 year 3 months 18 days	1 year 4 months 24 days	1 year 6 months

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Subparagraph (d)(2)
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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