Investments - Gains (Losses) on Strategic Investments, Net (Details) - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	$ 918	$ 1,803	$ 332
Realized gains on sales of securities, net	293	367	95
Gains on strategic investments, net	1,211	2,170	427
Cumulative net gain on equity securities	1,600	900
Publicly traded equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	(241)	1,743	138
Publicly traded equity securities \| Two publicly traded equity securities
Investment Holdings [Line Items]
Cumulative net gain on equity securities	1,500
Privately held equity securities
Investment Holdings [Line Items]
Unrealized gains (losses) recognized, net	1,210	184	270
Upward adjustments	1,200	167
Downward adjustments	18	1
Impairment loss on equity securities	43	107
Privately held equity securities \| One privately held equity investment
Investment Holdings [Line Items]
Realized gains on sales of securities, net	155
Upward adjustments	369
Privately held equity and debt securities
Investment Holdings [Line Items]
Impairments on privately held equity and debt securities	$ (51)	$ (124)	$ (76)

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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