Condensed Consolidated Statements of Stockholders’ Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings
Beginning balance (in shares) at Jan. 31, 2017		707
Beginning balance at Jan. 31, 2017	$ 8,230	$ 1	$ 8,040	$ (86)	$ 275
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		23
Common stock issued	709		709
Shares issued related to business combinations	12		12
Temporary equity reclassifications related to convertible notes	(4)		(4)
Stock-based expenses	995		995
Other comprehensive income, net of tax	74			74
Net income (loss)	360				360
Ending balance (in shares) at Jan. 31, 2018		730
Ending balance at Jan. 31, 2018	10,376	$ 1	9,752	(12)	635
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		21
Common stock issued	695		695
Shares issued related to business combinations (in shares)		13
Shares issued related to business combinations	2,195		2,195
Settlement of convertible notes and warrants (in shares)		6
Settlement of convertible notes and warrants	4		4
Stock-based expenses	1,281		1,281
Other comprehensive income, net of tax	(39)			(39)
Net income (loss)	1,110				1,110
Ending balance (in shares) at Jan. 31, 2019		770
Ending balance at Jan. 31, 2019	$ 15,605	$ 1	13,927	(58)	1,735
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)	7	21
Common stock issued	$ 816		816
Shares issued related to business combinations (in shares)		102
Shares issued related to business combinations	15,588		15,588
Stock-based expenses	1,785		1,785
Other comprehensive income, net of tax	(35)			(35)
Net income (loss)	126				126
Ending balance (in shares) at Jan. 31, 2020		893
Ending balance at Jan. 31, 2020	$ 33,885	$ 1	$ 32,116	$ (93)	$ 1,861