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						9 Months Ended
	Oct. 31, 2023	Jul. 31, 2023	Apr. 30, 2023	Oct. 31, 2022	Jul. 31, 2022	Apr. 30, 2022	Oct. 31, 2023	Oct. 31, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,206	$ 897	$ 1,145	$ 740	$ 681	$ 849	$ 1,145	$ 849
Common shares issued under stock plans	27	(31)	(21)	18	(17)	(10)
Stock-based compensation expense	179	195	160	165	163	146
Shares issued related to business combination						10
Settlement of liability-classified restricted common shares		8	1	3	5		9	8
Net income	241	222	161	198	186	146	624	530
Other comprehensive income (loss)	(59)	2	(15)	(38)	(21)	(24)
Repurchase and retirement of common shares	(112)	(87)	(534)	(180)	(257)	(436)
Ending balance	$ 1,482	$ 1,206	$ 897	$ 906	$ 740	$ 681	$ 1,482	$ 906
Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased and retired (in shares)	543			1,000			4,000	4,000
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share)	$ 205.70			$ 201.33			$ 200.35	$ 199.83
September 2016 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares remained available for repurchase under repurchase plans (in shares)	0			4,000			0	4,000
November 2022 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount remained available for repurchase under repurchase plans	$ 4,800						$ 4,800
Common stock and additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	214,000	214,000	215,000	216,000	217,000	218,000	215,000	218,000
Beginning balance	$ 3,531	$ 3,368	$ 3,325	$ 3,089	$ 2,972	$ 2,923	$ 3,325	$ 2,923
Common shares issued under stock plans (in shares)	1,000		2,000	1,000		1,000
Common shares issued under stock plans	$ 27	(31)	$ (21)	$ 18	(17)	$ (10)
Stock-based compensation expense	$ 179	195	160	165	163	146
Shares issued related to business combination						$ 10
Settlement of liability-classified restricted common shares		8	$ 1	$ 3	$ 5
Repurchase and retirement of common shares (in shares)	(1,000)		(3,000)	(1,000)	(1,000)	(2,000)
Repurchase and retirement of common shares	$ (59)	$ (9)	$ (97)	$ (62)	$ (34)	$ (97)
Ending balance (in shares)	214,000	214,000	214,000	216,000	216,000	217,000	214,000	216,000
Ending balance	$ 3,678	$ 3,531	$ 3,368	$ 3,213	$ 3,089	$ 2,972	$ 3,678	$ 3,213
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(198)	(200)	(185)	(169)	(148)	(124)	(185)	(124)
Other comprehensive income (loss)	(59)	2	(15)	(38)	(21)	(24)
Ending balance	(257)	(198)	(200)	(207)	(169)	(148)	(257)	(207)
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,127)	(2,271)	(1,995)	(2,180)	(2,143)	(1,950)	(1,995)	(1,950)
Net income	241	222	161	198	186	146
Repurchase and retirement of common shares	(53)	(78)	(437)	(118)	(223)	(339)
Ending balance	$ (1,939)	$ (2,127)	$ (2,271)	$ (2,100)	$ (2,180)	$ (2,143)	$ (1,939)	$ (2,100)