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, 2024	Apr. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,855	$ 1,145
Common shares issued under stock plans	(62)	(21)
Stock-based compensation expense	151	160
Settlement of liability-classified restricted common shares	3	1
Net income	252	161
Other comprehensive loss	(29)	(15)
Repurchase and retirement of common shares	(9)	(534)
Ending balance	$ 2,161	$ 897
Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock repurchased and retired (in shares)	33	2,666
Repurchased shares of its common stock on the open market, average repurchase price per share (in usd per share)	$ 254.81	$ 199.36
September 2016 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares remained available for repurchase under repurchase plans (in shares)		2
November 2022 Common Stock Repurchase Program
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amount remained available for repurchase under repurchase plans	$ 4,730	$ 5,000
Common stock and additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance (in shares)	214,000	215,000
Beginning balance	$ 3,802	$ 3,325
Common shares issued under stock plans (in shares)	1,000	2,000
Common shares issued under stock plans	$ (62)	$ (21)
Stock-based compensation expense	151	160
Settlement of liability-classified restricted common shares	$ 3	$ 1
Repurchase and retirement of common shares (in shares)	0	(3,000)
Repurchase and retirement of common shares	$ 0	$ (97)
Ending balance (in shares)	215,000	214,000
Ending balance	$ 3,894	$ 3,368
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(234)	(185)
Other comprehensive loss	(29)	(15)
Ending balance	(263)	(200)
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,713)	(1,995)
Net income	252	161
Repurchase and retirement of common shares	(9)	(437)
Ending balance	$ (1,470)	$ (2,271)