Stockholders' Equity - Schedule of Changes in Stockholders' Deficit by Component, Net of Tax (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				6 Months Ended
	Jul. 31, 2024	Apr. 30, 2024	Jul. 31, 2023	Apr. 30, 2023	Jul. 31, 2024	Jul. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,161	$ 1,855	$ 897	$ 1,145	$ 1,855	$ 1,145
Common shares issued under stock plans	(38)	(62)	(31)	(21)
Stock-based compensation expense	170	151	195	160
Settlement of liability-classified restricted common shares		3	8	1	3	9
Net income	282	252	222	161	534	383
Other comprehensive (loss) income	14	(29)	2	(15)	(15)	(13)
Repurchase and retirement of common shares	(115)	(9)	(87)	(534)
Ending balance	$ 2,474	$ 2,161	$ 1,206	$ 897	$ 2,474	$ 1,206
Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased and retired (in shares)	471,000		437,000		504,000	3,000,000
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share)	$ 244.63		$ 199.73		$ 245.29	$ 199.42
November 2022 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount remained available for repurchase under repurchase plans	$ 4,620		$ 4,910		$ 4,620	$ 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			0
Common stock and additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	215,000,000	214,000,000	214,000,000	215,000,000	214,000,000	215,000,000
Beginning balance	$ 3,894	$ 3,802	$ 3,368	$ 3,325	$ 3,802	$ 3,325
Common shares issued under stock plans (in shares)		1,000,000		2,000,000
Common shares issued under stock plans	(38)	$ (62)	(31)	$ (21)
Stock-based compensation expense	170	151	195	160
Settlement of liability-classified restricted common shares		$ 3	8	$ 1
Repurchase and retirement of common shares (in shares)				(3,000,000)
Repurchase and retirement of common shares	$ (17)		$ (9)	$ (97)
Ending balance (in shares)	215,000,000	215,000,000	214,000,000	214,000,000	215,000,000	214,000,000
Ending balance	$ 4,009	$ 3,894	$ 3,531	$ 3,368	$ 4,009	$ 3,531
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(263)	(234)	(200)	(185)	(234)	(185)
Other comprehensive (loss) income	14	(29)	2	(15)
Ending balance	(249)	(263)	(198)	(200)	(249)	(198)
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,470)	(1,713)	(2,271)	(1,995)	(1,713)	(1,995)
Net income	282	252	222	161
Repurchase and retirement of common shares	(98)	(9)	(78)	(437)
Ending balance	$ (1,286)	$ (1,470)	$ (2,127)	$ (2,271)	$ (1,286)	$ (2,127)