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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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Amount of investment in equity security without readily determinable fair value.

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

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Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value.

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Investments - Schedule of Strategic Investments (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Sep. 30, 2020	Jun. 30, 2020	Feb. 29, 2020	Jan. 31, 2020
Investment Holdings [Line Items]
Strategic investments	$ 3,927	$ 3,927		$ 3,927					$ 1,963
Strategic Investments [Roll Forward]
Carrying amount, beginning of period		1,537	$ 917	1,502	$ 785
Adjustments related to privately held equity securities:
Net additions		(55)	322	1	333
Upward adjustments		31	81	86	253
Impairments and downward adjustments		(6)	(3)	(82)	(54)
Carrying amount, end of period	1,507	1,507	1,317	1,507	1,317
Net unrealized gains (loss) recognized		1,000		1,600
Cumulative impairments and downward adjustments	184	184		184
Cumulative upward adjustments	540	540		540
Cumulative net gain on equity securities		18		545
Impairments on privately held equity and debt securities		8		99
Vlocity
Adjustments related to privately held equity securities:
Cumulative net realized gains				147
Equity securities
Investment Holdings [Line Items]
Strategic investments	3,879	3,879		3,879					1,912
Adjustments related to privately held equity securities:
Net realized gains (losses) recognized		11	14	299	76
Debt securities
Investment Holdings [Line Items]
Strategic investments	48	48		48					51
Adjustments related to privately held equity securities:
Net realized gains (losses) recognized		3	(1)	(10)	(11)
Technology company in preferred stock financing
Investment Holdings [Line Items]
Strategic investments							$ 100	$ 150
Publicly traded securities
Adjustments related to privately held equity securities:
Net unrealized gains (loss) recognized		997	$ (84)	1,620	$ 132
Publicly traded securities \| July 2020 IPO investment
Investment Holdings [Line Items]
Strategic investments	759	759		759
Adjustments related to privately held equity securities:
Net unrealized gains (loss) recognized		(92)		525
Publicly traded securities \| September 2020 IPO investment
Investment Holdings [Line Items]
Strategic investments	1,500	1,500		1,500		$ 250
Adjustments related to privately held equity securities:
Net unrealized gains (loss) recognized	1,100
Two publicly traded investments
Adjustments related to privately held equity securities:
Cumulative net gain on equity securities				314
Net realized gains (losses) recognized				222
Fair Value
Investment Holdings [Line Items]
Strategic investments	2,261	2,261		2,261					370
Fair Value \| Equity securities
Investment Holdings [Line Items]
Strategic investments	2,261	2,261		2,261					370
Fair Value \| Debt securities
Investment Holdings [Line Items]
Strategic investments	0	0		0					0
Measurement Alternative
Investment Holdings [Line Items]
Strategic investments	1,507	1,507		1,507					1,502
Measurement Alternative \| Equity securities
Investment Holdings [Line Items]
Strategic investments	1,507	1,507		1,507					1,502
Measurement Alternative \| Debt securities
Investment Holdings [Line Items]
Strategic investments	0	0		0					0
Other
Investment Holdings [Line Items]
Strategic investments	159	159		159					91
Other \| Equity securities
Investment Holdings [Line Items]
Strategic investments	111	111		111					40
Other \| Debt securities
Investment Holdings [Line Items]
Strategic investments	$ 48	$ 48		$ 48					$ 51