Investments - Schedule of Strategic Investments (Details) - USD ($) $ in Millions	Jan. 31, 2022	Jan. 31, 2021
Investment Holdings [Line Items]
Strategic investments	$ 4,784	$ 3,909
Variable Interest Entity, Not Primary Beneficiary
Investment Holdings [Line Items]
Strategic investments	467	129
Equity securities
Investment Holdings [Line Items]
Strategic investments	4,696	3,858
Debt securities and other investments
Investment Holdings [Line Items]
Strategic investments	88	51
Fair Value
Investment Holdings [Line Items]
Strategic investments	370	2,068
Fair Value | Equity securities
Investment Holdings [Line Items]
Strategic investments	370	2,068
Fair Value | Debt securities and other investments
Investment Holdings [Line Items]
Strategic investments	0	0
Measurement Alternative
Investment Holdings [Line Items]
Strategic investments	4,204	1,670
Measurement Alternative | Equity securities
Investment Holdings [Line Items]
Strategic investments	4,204	1,670
Measurement Alternative | Debt securities and other investments
Investment Holdings [Line Items]
Strategic investments	0	0
Other
Investment Holdings [Line Items]
Strategic investments	210	171
Other | Equity securities
Investment Holdings [Line Items]
Strategic investments	122	120
Other | Debt securities and other investments
Investment Holdings [Line Items]
Strategic investments	$ 88	$ 51