Investments - Components of Gains and Losses on Strategic Investments (Details) - USD ($) $ in Millions	3 Months Ended
Apr. 30, 2024	Apr. 30, 2023
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	$ (22)	$ (139)
Realized gains (losses) on sales of securities, net	59	(2)
Gains (losses) on strategic investments, net	37	(141)
Publicly traded equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	3	0
Privately held equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	105	38
Upward adjustments	116	46
Downward adjustments	139	175
Privately held equity and debt securities
Investment Holdings [Line Items]
Impairments on privately held equity and debt securities	$ (130)	$ (177)

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

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Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value.

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Amount of realized and unrealized gain (loss) on investment.

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