Investments - Components of Gains and Losses on Strategic Investments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2025	Jul. 31, 2024
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	$ (20)	$ (38)	$ (76)	$ (60)
Realized gains on sales of securities, net	26	1	19	60
Gains (losses) on strategic investments, net	6	(37)	(57)	0
Publicly traded equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	13	(22)	(3)	(19)
Privately held equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	53	44	60	149
Privately held equity and other investments
Investment Holdings [Line Items]
Impairments on privately held equity securities and other investments	$ (86)	$ (60)	$ (133)	$ (190)