Adjustments Related to Privately Held Equity Investments [Abstract]

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Equity Securities without Readily Determinable Fair Value, Impairment Loss and Downward Price Adjustment, Annual Amount

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Number of Publicly Traded Investments Sold

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Strategic Investments, Net Additions (Reductions)

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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 (Detail) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2020 USD ($) employee	Jul. 31, 2020 USD ($) employee	Jul. 31, 2019 USD ($)	Jul. 31, 2020 USD ($) employee	Jul. 31, 2019 USD ($)	Jun. 30, 2020 USD ($)	Feb. 29, 2020 USD ($)	Jan. 31, 2020 USD ($)
Investment Holdings [Line Items]
Strategic investments	$ 2,555	$ 2,555		$ 2,555				$ 1,963
Strategic Investments [Roll Forward]
Carrying amount, beginning of period		1,731	$ 927	1,502	$ 785
Adjustments related to privately held equity securities:
Net additions		(209)	(9)	56	11
Upward adjustments		25	32	55	172
Impairments and downward adjustments		(10)	(33)	(76)	(51)
Carrying amount, end of period	1,537	1,537	917	1,537	917
Net unrealized gains (loss) recognized		(633)		(586)
Cumulative impairments and downward adjustments	178	178		178
Cumulative upward adjustments	$ 509	509		509
Cumulative net gain on equity securities		$ 168		$ 527
Number of publicly traded investments sold \| employee	2	2		2
Impairments on privately held equity and debt securities		$ 14		$ 91
Vlocity
Adjustments related to privately held equity securities:
Cumulative net gain on equity securities		147		147
Equity securities
Investment Holdings [Line Items]
Strategic investments	$ 2,511	2,511		2,511				1,912
Adjustments related to privately held equity securities:
Net realized gains (losses) recognized		49	43	288	62
Debt securities
Investment Holdings [Line Items]
Strategic investments	44	44		44				51
Adjustments related to privately held equity securities:
Net realized gains (losses) recognized		(4)	0	(13)	(10)
Technology company in preferred stock financing
Investment Holdings [Line Items]
Strategic investments						$ 100	$ 150
Two publicly traded investments
Adjustments related to privately held equity securities:
Cumulative net gain on equity securities				314
Net realized gains (losses) recognized				222
Publicly traded securities
Investment Holdings [Line Items]
Strategic investments	851	851		851
Adjustments related to privately held equity securities:
Net unrealized gains (loss) recognized	617	623	$ 66	623	$ 216
Fair Value
Investment Holdings [Line Items]
Strategic investments	864	864		864				370
Fair Value \| Equity securities
Investment Holdings [Line Items]
Strategic investments	864	864		864				370
Fair Value \| Debt securities
Investment Holdings [Line Items]
Strategic investments	0	0		0				0
Measurement Alternative
Investment Holdings [Line Items]
Strategic investments	1,537	1,537		1,537				1,502
Measurement Alternative \| Equity securities
Investment Holdings [Line Items]
Strategic investments	1,537	1,537		1,537				1,502
Measurement Alternative \| Debt securities
Investment Holdings [Line Items]
Strategic investments	0	0		0				0
Other
Investment Holdings [Line Items]
Strategic investments	154	154		154				91
Other \| Equity securities
Investment Holdings [Line Items]
Strategic investments	110	110		110				40
Other \| Debt securities
Investment Holdings [Line Items]
Strategic investments	$ 44	$ 44		$ 44				$ 51