Investments - Schedule of Short-Term and Long-Term Marketable Securities (Details) - USD ($) $ in Millions	Jan. 31, 2025	Jan. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Due within 1 year	$ 2,081	$ 2,523
Due in 1 year through 5 years	3,098	3,180
Due in 5 years through 10 years	5	19
Fair value of marketable securities	$ 5,184	$ 5,722