Investments - Components of Gains and Losses on Strategic Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	$ (240)	$ (318)	$ (310)
Realized gains on sales of securities, net	119	41	71
Losses on strategic investments, net	(121)	(277)	(239)
Publicly traded equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	(16)	29	1
Privately held equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	358	119	180
Privately held equity and debt securities
Investment Holdings [Line Items]
Impairments on privately held equity and debt securities	$ (582)	$ (466)	$ (491)