Employee Incentive Plans - Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Number of Options  (in thousands)
Number of options, outstanding beginning of period (in shares)	7,984
Number of options, exercised (in shares)	(1,416)
Number of options, expired (in shares)	(26)
Number of options, forfeited (in shares)	(189)
Number of options, outstanding end of period (in shares)	6,353	7,984
Vested and expected to vest, number of options (in shares)	6,353
Vested and exercisable, number of options (in shares)	5,729
Weighted- Average Exercise Price
Options outstanding, weighted average exercise price beginning of period (in dollars per share)	$ 39.59
Options exercised, weighted average exercise price (in dollars per share)	11.92
Options expired, weighted average exercise price (in dollars per share)	189.80
Options forfeited, weighted average exercise price (in dollars per share)	80.67
Options outstanding, weighted average exercise price end of period (in dollars per share)	43.92	$ 39.59
Vested and expected to vest, weighted average exercise price (in dollars per share)	43.92
Vested and exercisable, weighted average exercise price (in dollars per share)	$ 29.75
Additional Disclosures
Options outstanding, weighted average remaining contractual term	4 years 3 months 18 days	5 years 2 months 12 days
Vested and expected to vest, weighted average remaining contractual term	4 years 3 months 18 days
Vested and exercisable, weighted average remaining contractual term	3 years 10 months 24 days
Options outstanding, aggregate intrinsic value	$ 331	$ 1,314
Vested and expected to vest, aggregate intrinsic value	331
Vested and exercisable, aggregate intrinsic value	$ 323