The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
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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.

+ References

No definition available.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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Overview and Basis of Presentation (Detail) $ in Millions	3 Months Ended		9 Months Ended
Overview and Basis of Presentation (Detail) $ in Millions	Oct. 31, 2023 USD ($)	Oct. 31, 2022 USD ($)	Oct. 31, 2023 USD ($) segment	Oct. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Decrease in depreciation expense	$ (52)	$ (69)	$ (149)	$ (207)
Number of operating segments \| segment			1
Data Center Equipment \| Long-Lived Tangible Assets, Amortization Period
Property, Plant and Equipment [Line Items]
Decrease in depreciation expense	$ 22		$ 77
Minimum \| Data Center Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	3 years		3 years
Maximum \| Data Center Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life (years)	5 years		5 years