Revenues - Schedule of Change in Unearned Revenue (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2025	Apr. 30, 2024
Unearned Revenue [Roll Forward]
Unearned revenue, beginning of period	$ 20,743	$ 19,003
Billings and other	6,885	6,191
Unearned revenue, end of period	17,799	16,061
Revenue recognized over time
Unearned Revenue [Roll Forward]
Revenue recognized	(9,211)	(8,571)
Revenue recognized at a point in time
Unearned Revenue [Roll Forward]
Revenue recognized	$ (618)	$ (562)

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant