Stockholders' Equity - Share-based Compensation, Stock Options, Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2025 USD ($) $ / shares shares
Shares Available for Grant (in millions)
Beginning balance (in shares)	60
Ending balance (in shares)	73
Outstanding Stock Options (in millions)
Beginning balance (in shares)	12
Exercised (in shares)	(4)
Ending balance (in shares)	8
Outstanding Stock Options, Vested or expected to vest (in shares)	8
Outstanding Stock Options, Exercisable (in shares)	6
Weighted- Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 185.77
Exercised (in dollars per share) | $ / shares	173.43
Ending balance (in dollars per share) | $ / shares	198.89
Weighted-Average Exercise Price, Vested or expected to vest (in dollars per share) | $ / shares	198.10
Weighted-Average Exercise Price, Exercisable (in dollars per share) | $ / shares	$ 187.48
Aggregate Intrinsic Value (in millions)
Balance | $	$ 1,140
Vested or expected to vest | $	1,126
Exercisable | $	$ 883
Restricted stock
Shares Available for Grant (in millions)
Restricted stock and restricted stock unit activity (in shares)	(23)
2013 Equity Incentive Plan
Shares Available for Grant (in millions)
Increase in shares authorized (in shares)	36
Ending balance (in shares)	73