Deferred Compensation (Details) - USD ($)	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Costs to obtain a contract	$ 467,000,000	$ 210,000,000
Amortization of costs to obtain a contract with a customer	212,000,000	140,000,000	$ 138,000,000
Impairment loss	0	0	0
Revision of Prior Period, Reclassification, Adjustment
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Amortization of costs to obtain a contract with a customer	212,000,000	140,000,000	$ 138,000,000
Rabbi Trust
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation liability	118,000,000	100,000,000
Deferred compensation liability, current	12,000,000	10,000,000
Deferred compensation liability, non-current	$ 106,000,000	$ 90,000,000