Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Jan. 31, 2025
Investment Holdings [Line Items]
Interest income from marketable securities	$ 169	$ 196
Strategic investments	4,941		$ 4,852
Privately held equity securities
Investment Holdings [Line Items]
Upward adjustments	21	116
Downward adjustments	60	$ 139
Variable Interest Entity, Not Primary Beneficiary
Investment Holdings [Line Items]
Strategic investments	$ 476		$ 484