Taxes - Reconciliation of Unrecognized Tax Benefits from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Reconciliation of Unrecognized Tax Benefits
Gross unrecognized tax benefits, beginning of year	$ 3,307	$ 3,245	$ 3,135
Increases related to prior year tax positions	336	79	170
Decreases related to prior year tax positions	(74)	(248)	(97)
Increases related to current year tax positions	102	357	75
Settlements during the period	(102)	(89)	(5)
Lapse in statutes of limitations	(29)	(37)	(33)
Gross unrecognized tax benefits, end of year	$ 3,540	$ 3,307	$ 3,245

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Name Accounting Standards Codification
-Section 50
-Paragraph 15A
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-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 15A
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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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