Stockholders' Equity - Share-based Compensation, Stock Options, Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2022 USD ($) $ / shares shares
Shares Available for Grant
Beginning balance (in shares)	82
Ending balance (in shares)	66
Outstanding Stock Options
Beginning balance (in shares)	23
Options granted under all plans (in shares)	8
Exercised (in shares)	(7)
Plan shares expired or canceled (in shares)	(3)
Ending balance (in shares)	21
Outstanding Stock Options, Vested or expected to vest (in shares)	20
Outstanding Stock Options, Exercisable (in shares)	9
Options Outstanding Weighted-Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 120.61
Options granted under all plans (in dollars per share) | $ / shares	201.38
Exercised (in dollars per share) | $ / shares	89.26
Plan shares expired or canceled (in dollars per share) | $ / shares	163.48
Ending balance (in dollars per share) | $ / shares	156.34
Weighted-Average Exercise Price, Vested or expected to vest (in dollars per share) | $ / shares	153.87
Weighted-Average Exercise Price, Exercisable (in dollars per share) | $ / shares	$ 115.76
Aggregate Intrinsic Value
Balance | $	$ 3,078
Vested or expected to vest | $	2,934
Exercisable | $	$ 1,709
Restricted stock
Shares Available for Grant
Restricted stock and restricted stock unit activity (in shares)	(26)
Performance shares
Shares Available for Grant
Restricted stock and restricted stock unit activity (in shares)	(2)
2013 Equity Incentive Plan
Shares Available for Grant
Increase in shares authorized (in shares)	10
Ending balance (in shares)	66
Acquired equity plans
Shares Available for Grant
Increase in shares authorized (in shares)	7