Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Value of input used to measure long-term debt.

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Debt - Narrative (Details)	12 Months Ended
Debt - Narrative (Details)	Jan. 31, 2025 USD ($) $ / shares	Jan. 31, 2024 USD ($) $ / shares	Jan. 31, 2023 USD ($)	Oct. 31, 2024 USD ($)	Dec. 23, 2020 USD ($)
Line of Credit Facility [Line Items]
Debt interest expense	$ 272,000,000	$ 283,000,000	$ 300,000,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 5,000,000,000	$ 3,000,000,000
Outstanding borrowings for line of credit	$ 0				$ 0
Closing trading price
Line of Credit Facility [Line Items]
Long-term debt measurement input \| $ / shares	100	100
Senior Notes \| Significant Other Observable Inputs (Level 2)
Line of Credit Facility [Line Items]
Senior Notes fair value	$ 6,600,000,000	$ 7,800,000,000