Investments - Gains (Losses) on Strategic Investments, Net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	$ 249	$ 1,000
Realized gains on sales of securities, net	114	18	$ 271	$ 306
Gains on strategic investments, net	363	1,036	1,177	1,910
Cumulative net gain on equity securities	498		1,600
Publicly traded securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	98	997	(13)	1,620
Privately held securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	162	29	964	83
Privately held equity and debt securities
Investment Holdings [Line Items]
Impairments on privately held equity and debt securities	(11)	$ (8)	(45)	$ (99)
One publicly traded investment
Investment Holdings [Line Items]
Realized gains on sales of securities, net	112		155
Two publicly traded investments
Investment Holdings [Line Items]
Cumulative net gain on equity securities	$ 505		$ 1,500

Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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