CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Settlement of convertible senior notes	Adjustment	Common Stock Class A Common Stock	Common Stock Class A Common Stock  Conversion of Class B common stock to Class A common stock	Common Stock Class A Common Stock  Settlement of convertible senior notes	Common Stock Class B Common Stock	Common Stock Class B Common Stock  Conversion of Class B common stock to Class A common stock	Additional Paid-in Capital	Additional Paid-in Capital Settlement of convertible senior notes	Additional Paid-in Capital Adjustment	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Accumulated Deficit Adjustment
Beginning balance (in shares) at Jan. 31, 2020				113,990			8,648
Beginning balance at Jan. 31, 2020	$ 405			$ 0			$ 0		$ 1,106			$ 1	$ (702)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options and other activity, net (in shares)				4,114			254
Issuance of common stock upon exercise of stock options and other activity, net	46								46
Issuance of common stock under employee stock purchase plan, net of cancellations (in shares)				247
Issuance of common stock under employee stock purchase plan, net of cancellations	26								26
Issuance of common stock for settlement of restricted stock units (in shares)				2,109
Issuance of common stock for bonus settlement (in shares)				86
Issuance of common stock for bonus settlement	10								10
Issuance of common stock pursuant to charitable donation (in shares)				43
Issuance of common stock pursuant to charitable donation	9								9
Conversion of convertible securities (in shares)				743			(743)
Proceeds from hedges related to convertible senior notes (in shares)				(168)
Equity component of convertible senior notes, net of issuance costs	306								306
Equity component of early extinguishment of convertible senior notes (in shares)				1,660
Equity component of early extinguishment and conversion of convertible senior notes	70								70
Proceeds from hedges related to convertible senior notes	195								195
Payments for warrants related to convertible senior notes	(175)								(175)
Purchases of capped calls related to convertible senior notes	(134)								(134)
Stock-based compensation	197								197
Other comprehensive income	4											4
Net loss	(266)			$ (249)			$ (17)						(266)
Ending balance (in shares) at Jan. 31, 2021				122,824			8,159
Ending balance at Jan. 31, 2021	$ 693			$ 0			$ 0		1,656			5	(968)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2020-06 [Member]
Issuance of common stock in connection with business combinations (in shares)				19,190
Issuance of common stock in connection with business combinations	$ 5,409								5,409
Issuance of common stock in connection with business combinations subject to future vesting (in shares)				1,269
Issuance of common stock upon exercise of stock options and other activity, net (in shares)				2,552			2
Issuance of common stock upon exercise of stock options and other activity, net	54								54
Issuance of common stock under employee stock purchase plan, net of cancellations (in shares)				186
Issuance of common stock under employee stock purchase plan, net of cancellations	36								36
Issuance of common stock for settlement of restricted stock units (in shares)				2,294
Issuance of common stock pursuant to charitable donation (in shares)				30
Issuance of common stock pursuant to charitable donation	7								7
Conversion of convertible securities (in shares)				1,183			(1,183)
Proceeds from hedges related to convertible senior notes (in shares)				(380)
Equity component of early extinguishment of convertible senior notes (in shares)				476
Equity component of early extinguishment and conversion of convertible senior notes	21								21
Stock-based compensation	567								567
Other comprehensive income	(17)											(17)
Net loss	(848)			$ (806)			$ (42)						(848)
Ending balance (in shares) at Jan. 31, 2022				149,624			6,978
Ending balance at Jan. 31, 2022	$ 5,922		$ (372)	$ 0			$ 0		7,750		$ (528)	(12)	(1,816)	$ 156
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with business combinations subject to future vesting (in shares)				(14)
Issuance of common stock upon exercise of stock options and other activity, net (in shares)	1,416			965			451
Issuance of common stock upon exercise of stock options and other activity, net	$ 17								17
Issuance of common stock under employee stock purchase plan, net of cancellations (in shares)				492
Issuance of common stock under employee stock purchase plan, net of cancellations	31								31
Issuance of common stock for settlement of restricted stock units (in shares)				2,555
Issuance of common stock pursuant to charitable donation (in shares)				42
Issuance of common stock pursuant to charitable donation	4								4
Conversion of convertible securities (in shares)					129	356		(129)
Conversion of convertible securities		$ 17								$ 17
Proceeds from hedges related to convertible senior notes (in shares)				(140)
Stock-based compensation	683								683
Other comprehensive income	(21)											(21)
Net loss	(815)			$ (778)			$ (37)						(815)
Ending balance (in shares) at Jan. 31, 2023				154,009			7,300
Ending balance at Jan. 31, 2023	$ 5,466			$ 0			$ 0		$ 7,974			$ (33)	$ (2,475)