Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Jan. 31, 2025
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,621	$ 1,855
Common shares issued under stock plans	(73)	(62)
Stock-based compensation expense	233	151
Settlement of liability-classified restricted common shares	0	3
Net income	152	252
Other comprehensive income (loss)	37	(29)
Repurchase and retirement of common shares	(353)	(9)
Ending balance	2,617	$ 2,161
Common stocks, including additional paid in capital	$ 4,324		$ 4,239
Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased and retired (in shares)	1,000	33
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share)	$ 268.67	$ 254.81
November 2022 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount remained available for repurchase under repurchase plans	$ 3,530	$ 4,730
November 2024 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount remained available for repurchase under repurchase plans	$ 5,000
Common stock and additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	214,000	214,000
Beginning balance	$ 4,239	$ 3,802
Common shares issued under stock plans (in shares)	1,000	1,000
Common shares issued under stock plans	$ (73)	$ (62)
Stock-based compensation expense	$ 233	151
Settlement of liability-classified restricted common shares		$ 3
Repurchase and retirement of common shares (in shares)	(1,000)	0
Repurchase and retirement of common shares	$ (75)	$ 0
Ending balance (in shares)	214,000	215,000
Ending balance	$ 4,324	$ 3,894
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(285)	(234)
Other comprehensive income (loss)	37	(29)
Ending balance	(248)	(263)
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,333)	(1,713)
Net income	152	252
Repurchase and retirement of common shares	(278)	(9)
Ending balance	$ (1,459)	$ (1,470)