Stockholders' Equity - Schedule of Changes in Stockholders' Deficit by Component, Net of Tax (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,145	$ 849
Common shares issued under stock plans	(21)	(10)
Stock-based compensation expense	160	146
Shares issued related to business combination		10
Settlement of liability-classified restricted common shares	1	0
Net income	161	146
Other comprehensive loss	(15)	(24)
Repurchase and retirement of common shares	(534)	(436)
Ending balance	$ 897	$ 681
Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased and retired (in shares)	2,666	2,058
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share)	$ 199.36	$ 211.71
September 2016 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares remained available for repurchase under repurchase plans (in shares)	2	6,000
November 2022 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)	215,000	218,000
Beginning balance	$ 3,325	$ 2,923
Common shares issued under stock plans (in shares)	2,000	1,000
Common shares issued under stock plans	$ (21)	$ (10)
Stock-based compensation expense	160	146
Shares issued related to business combination		$ 10
Settlement of liability-classified restricted common shares	$ 1
Repurchase and retirement of common shares (in shares)	(3,000)	(2,000)
Repurchase and retirement of common shares	$ (97)	$ (97)
Ending balance (in shares)	214,000	217,000
Ending balance	$ 3,368	$ 2,972
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(185)	(124)
Other comprehensive loss	(15)	(24)
Ending balance	(200)	(148)
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,995)	(1,950)
Net income	161	146
Repurchase and retirement of common shares	(437)	(339)
Ending balance	$ (2,271)	$ (2,143)