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				6 Months Ended
	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2023	Jul. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 897	$ 1,145	$ 681	$ 849	$ 1,145	$ 849
Common shares issued under stock plans	(31)	(21)	(17)	(10)
Stock-based compensation expense	195	160	163	146
Shares issued related to business combination				10
Settlement of liability-classified restricted common shares	8	1	5		9	5
Net income	222	161	186	146	383	332
Other comprehensive loss	2	(15)	(21)	(24)
Repurchase and retirement of common shares	(87)	(534)	(257)	(436)
Ending balance	$ 1,206	$ 897	$ 740	$ 681	$ 1,206	$ 740
Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased and retired (in shares)	437		1,000		3,000	3,000
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share)	$ 199.73		$ 181.64		$ 199.42	$ 199.45
November 2022 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount remained available for repurchase under repurchase plans	$ 4,910				$ 4,910
September 2016 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares remained available for repurchase under repurchase plans (in shares)	0		5,000		0	5,000
Common stock and additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	214,000	215,000	217,000	218,000	215,000	218,000
Beginning balance	$ 3,368	$ 3,325	$ 2,972	$ 2,923	$ 3,325	$ 2,923
Common shares issued under stock plans (in shares)		2,000		1,000
Common shares issued under stock plans	(31)	$ (21)	(17)	$ (10)
Stock-based compensation expense	195	160	163	146
Shares issued related to business combination				$ 10
Settlement of liability-classified restricted common shares	$ 8	$ 1	$ 5
Repurchase and retirement of common shares (in shares)	0	(3,000)	(1,000)	(2,000)
Repurchase and retirement of common shares	$ (9)	$ (97)	$ (34)	$ (97)
Ending balance (in shares)	214,000	214,000	216,000	217,000	214,000	216,000
Ending balance	$ 3,531	$ 3,368	$ 3,089	$ 2,972	$ 3,531	$ 3,089
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(200)	(185)	(148)	(124)	(185)	(124)
Other comprehensive loss	2	(15)	(21)	(24)
Ending balance	(198)	(200)	(169)	(148)	(198)	(169)
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,271)	(1,995)	(2,143)	(1,950)	(1,995)	(1,950)
Net income	222	161	186	146
Repurchase and retirement of common shares	(78)	(437)	(223)	(339)
Ending balance	$ (2,127)	$ (2,271)	$ (2,180)	$ (2,143)	$ (2,127)	$ (2,180)