Business and Summary of Significant Accounting Policies - Costs to Obtain a Contract with a Customer (Details) - USD ($)	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Product Information [Line Items]
Costs to obtain a contract	$ 913,000,000	$ 467,000,000
Current liability	550,000,000	282,000,000
Amortization of costs to obtain a contract with a customer	536,000,000	212,000,000	$ 140,000,000
Impairment loss	$ 0	0	0
Minimum
Product Information [Line Items]
Amortized based on the contract term	1 year
Maximum
Product Information [Line Items]
Amortized based on the contract term	3 years
Revision of Prior Period, Reclassification, Adjustment
Product Information [Line Items]
Amortization of costs to obtain a contract with a customer	$ 536,000,000	$ 212,000,000	$ 140,000,000