Employee Incentive Plans - Schedule of Unrecognized Stock-based Compensation Expense (Details) $ in Millions	9 Months Ended
	Oct. 31, 2025 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	$ 689
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 664
Weighted-average remaining period (in years)	1 year 9 months 18 days
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 22
Weighted-average remaining period (in years)	2 years 1 month 6 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 3
Weighted-average remaining period (in years)	3 months 18 days