Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Apr. 30, 2026	Apr. 30, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 3,045	$ 2,621
Common shares issued under stock plans	(55)	(73)
Stock-based compensation expense	159	233
Net income	491	152
Other comprehensive loss	(2)	37
Repurchase and retirement of common shares	(449)	(353)
Ending balance	$ 3,189	$ 2,617
Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased and retired (in shares)	2	1
Average repurchase price per share (in dollars per share)	$ 239.87	$ 268.67
November 2022 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount remained available for repurchase	$ 2,040	$ 3,530
November 2024 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount remained available for repurchase	$ 5,000	$ 5,000
Common stock and additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	212	214
Beginning balance	$ 4,709	$ 4,239
Common shares issued under stock plans (in shares)	1	1
Common shares issued under stock plans	$ (55)	$ (73)
Stock-based compensation expense	$ 159	$ 233
Repurchase and retirement of common shares (in shares)	(2)	(1)
Repurchase and retirement of common shares	$ (87)	$ (75)
Ending balance (in shares)	211	214
Ending balance	$ 4,726	$ 4,324
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(232)	(285)
Other comprehensive loss	(2)	37
Ending balance	(234)	(248)
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,432)	(1,333)
Net income	491	152
Repurchase and retirement of common shares	(362)	(278)
Ending balance	$ (1,303)	$ (1,459)