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Investments - Schedule of Strategic Investments (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Jan. 31, 2019
Investment Holdings [Line Items]
Strategic investments		$ 1,614		$ 1,614		$ 1,302
Strategic Investments [Roll Forward]
Carrying amount, beginning of period		927	$ 554	785	$ 548
Adjustments related to privately held equity securities:
Net additions (reductions)		(9)	19	11	30
Impairments and downward adjustments		(33)	(5)	(51)	(23)
Upward adjustments		32	99	172	112
Carrying amount, beginning of period	$ 927	917	667	917	667
Cumulative impairments and downward adjustments		83		83
Cumulative upward adjustments		346		346
Net realized gains (losses) recognized		66		328
Gains on strategic investments, net		109	143	390	354
Publicly traded securities
Adjustments related to privately held equity securities:
Net realized gains (losses) recognized		66	65	216	276
Privately held securities
Adjustments related to privately held equity securities:
Net realized gains (losses) recognized		0	90	122	81
Equity securities
Investment Holdings [Line Items]
Strategic investments		1,581		1,581		1,271
Adjustments related to privately held equity securities:
Net realized gains (losses) recognized		43	1	62	9
Debt securities
Investment Holdings [Line Items]
Strategic investments		33		33		31
Adjustments related to privately held equity securities:
Net realized gains (losses) recognized		0	$ (13)	(10)	$ (12)
Private Placement, Technology Company
Investment Holdings [Line Items]
Strategic investments	$ 100
Adjustments related to privately held equity securities:
Term of market standoff agreement	365 days
Fair value of investment		$ 265		$ 265
Economic interest		1.00%		1.00%
Fair Value
Investment Holdings [Line Items]
Strategic investments		$ 607		$ 607		436
Fair Value \| Equity securities
Investment Holdings [Line Items]
Strategic investments		607		607		436
Fair Value \| Debt securities
Investment Holdings [Line Items]
Strategic investments		0		0		0
Measurement Alternative
Investment Holdings [Line Items]
Strategic investments		917		917		785
Measurement Alternative \| Equity securities
Investment Holdings [Line Items]
Strategic investments		917		917		785
Measurement Alternative \| Debt securities
Investment Holdings [Line Items]
Strategic investments		0		0		0
Other
Investment Holdings [Line Items]
Strategic investments		90		90		81
Other \| Equity securities
Investment Holdings [Line Items]
Strategic investments		57		57		50
Other \| Debt securities
Investment Holdings [Line Items]
Strategic investments		$ 33		$ 33		$ 31