Investments - Components of Gains and Losses on Strategic Investments (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	$ (56)	$ (22)
Realized gains (losses) on sales of securities, net	(7)	59
Gains (losses) on strategic investments, net	(63)	37
Publicly traded equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	(16)	3
Privately held equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	7	105
Privately held equity and other investments
Investment Holdings [Line Items]
Impairments on privately held equity securities and other investments	$ (47)	$ (130)