Stockholders' Equity - Schedule of Restricted Stock Activity (Details) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 30, 2025 USD ($) $ / shares shares
Restricted stock
Outstanding (in millions)
Beginning balance (in shares)	26
Granted (in shares)	9
Canceled (in shares)	(1)
Vested and converted to shares (in shares)	(6)
Ending balance (in shares)	30
Expected to vest (in shares)	26
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 250.50
Granted (in dollars per share) | $ / shares	280.81
Canceled (in dollars per share) | $ / shares	246.06
Vested and converted to shares (in dollars per share) | $ / shares	256.18
Ending balance (in dollars per share) | $ / shares	$ 260.00
Aggregate Intrinsic Value (in millions)
Aggregate Intrinsic Value, Outstanding | $	$ 8,102
Aggregate Intrinsic Value, Expected to vest | $	$ 6,870
Performance shares
Outstanding (in millions)
Granted (in shares)	2
Weighted Average Grant Date Fair Value
Granted (in dollars per share) | $ / shares	$ 273.56