Employee Incentive Plans - Schedule of Unrecognized Stock-based Compensation Expense (Details) $ in Millions	6 Months Ended
	Jul. 31, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, stock option	$ 51
Total	1,358
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, non-stock option	$ 1,212
Weighted-average remaining period (in years)	2 years 8 months 12 days
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, non-stock option	$ 85
Weighted-average remaining period (in years)	9 months 18 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining period (in years)	1 year 4 months 24 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs, non-stock option	$ 10
Weighted-average remaining period (in years)	6 months