Investments - Components of Gains and Losses on Strategic Investments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	$ (216)	$ (86)	$ (276)	$ (290)
Realized gains (losses) on sales of securities, net	(1)	14	59	48
Losses on strategic investments, net	(217)	(72)	(217)	(242)
Publicly traded equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	8	(2)	(11)	0
Privately held equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	18	14	167	65
Upward adjustments	22	14	182	65
Downward adjustments	245	98	435	354
Privately held equity and debt securities
Investment Holdings [Line Items]
Impairments on privately held equity and debt securities	$ (242)	$ (98)	$ (432)	$ (355)

Debt Securities and Equity Securities without Readily Determinable Fair Value, Impairment Gain (Loss)

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