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Deferred Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended
Deferred Compensation (Details) - USD ($)	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023	Jan. 31, 2024
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Costs to obtain a contract	$ 257,000,000		$ 257,000,000		$ 210,000,000
Amortization of costs to obtain a contract with a customer	51,000,000	$ 34,000,000	136,000,000	$ 97,000,000
Impairment losses	0	$ 0	0	$ 0
Prepaid expenses and other current assets
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Costs to obtain a contract	160,000,000		160,000,000
Long-term other assets
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Costs to obtain a contract	97,000,000		97,000,000
Rabbi Trust
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation liability	118,000,000		118,000,000		100,000,000
Deferred compensation liability, current	12,000,000		12,000,000		10,000,000
Deferred compensation liability, non-current	$ 106,000,000		$ 106,000,000		$ 90,000,000