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, 2020		893
Beginning balance at Jan. 31, 2020	$ 33,885	$ 1	$ 32,116	$ (93)	$ 1,861
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		6
Common stock issued	119		119
Stock-based expense	504		504
Other comprehensive income (loss), net	(42)			(42)
Net income	99				99
Ending balance (in shares) at Apr. 30, 2020		899
Ending balance at Apr. 30, 2020	34,565	$ 1	32,739	(135)	1,960
Beginning balance (in shares) at Jan. 31, 2020		893
Beginning balance at Jan. 31, 2020	33,885	$ 1	32,116	(93)	1,861
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), net	9
Net income	3,805
Ending balance (in shares) at Oct. 31, 2020		914
Ending balance at Oct. 31, 2020	40,310	$ 1	34,727	(84)	5,666
Beginning balance (in shares) at Apr. 30, 2020		899
Beginning balance at Apr. 30, 2020	34,565	$ 1	32,739	(135)	1,960
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		9
Common stock issued	605		605
Stock-based expense	578		578
Other comprehensive income (loss), net	67			67
Net income	2,625				2,625
Ending balance (in shares) at Jul. 31, 2020		908
Ending balance at Jul. 31, 2020	38,440	$ 1	33,922	(68)	4,585
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		6
Common stock issued	239		239
Stock-based expense	566		566
Other comprehensive income (loss), net	(16)			(16)
Net income	1,081				1,081
Ending balance (in shares) at Oct. 31, 2020		914
Ending balance at Oct. 31, 2020	40,310	$ 1	34,727	(84)	5,666
Beginning balance (in shares) at Jan. 31, 2021		919
Beginning balance at Jan. 31, 2021	41,493	$ 1	35,601	(42)	5,933
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		6
Common stock issued	67		67
Stock-based expense	564		564
Other comprehensive income (loss), net	(26)			(26)
Net income	469				469
Ending balance (in shares) at Apr. 30, 2021		925
Ending balance at Apr. 30, 2021	42,567	$ 1	36,232	(68)	6,402
Beginning balance (in shares) at Jan. 31, 2021		919
Beginning balance at Jan. 31, 2021	41,493	$ 1	35,601	(42)	5,933
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), net	(80)
Net income	1,472
Ending balance (in shares) at Oct. 31, 2021		984
Ending balance at Oct. 31, 2021	57,054	$ 1	49,770	(122)	7,405
Beginning balance (in shares) at Apr. 30, 2021		925
Beginning balance at Apr. 30, 2021	42,567	$ 1	36,232	(68)	6,402
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		7
Common stock issued	525		525
Shares issued related to the acquisition of Slack (in shares)		46
Shares issued related to the acquisition of Slack	11,269		11,269
Stock-based expense	640		640
Other comprehensive income (loss), net	(16)			(16)
Net income	535				535
Ending balance (in shares) at Jul. 31, 2021		978
Ending balance at Jul. 31, 2021	55,520	$ 1	48,666	(84)	6,937
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued (in shares)		6
Common stock issued	292		292
Stock-based expense	812		812
Other comprehensive income (loss), net	(38)			(38)
Net income	468				468
Ending balance (in shares) at Oct. 31, 2021		984
Ending balance at Oct. 31, 2021	$ 57,054	$ 1	$ 49,770	$ (122)	$ 7,405