Employee Incentive Plans - Schedule of Unrecognized Stock-based Compensation Expense (Details) $ in Millions	9 Months Ended
	Oct. 31, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, stock option	$ 26
Total	1,139
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, non-stock option	$ 1,053
Weighted-average remaining period (in years)	2 years 6 months
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, non-stock option	$ 56
Weighted-average remaining period (in years)	6 months
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining period (in years)	1 year
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, non-stock option	$ 4
Weighted-average remaining period (in years)	3 months 18 days