Investments - Schedule of Short-Term and Long-Term Marketable Securities (Details) - USD ($) $ in Millions	Apr. 30, 2025	Jan. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Due within 1 year	$ 3,197	$ 2,081
Due in 1 year through 5 years	3,276	3,098
Due in 5 years through 10 years	7	5
Fair value of marketable securities	$ 6,480	$ 5,184