Net Income Per Share - Schedule of Computation of Net Income Per Share Amounts (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jul. 31, 2025	Apr. 30, 2025	Jul. 31, 2024	Apr. 30, 2024	Jul. 31, 2025	Jul. 31, 2024
Numerator:
Net income	$ 313	$ 152	$ 282	$ 252	$ 465	$ 534
Denominator:
Denominator for basic net income per share—weighted average shares (in shares)	213		216		214	215
Effect of dilutive securities (in shares)	2		1		2	2
Denominator for dilutive net income per share (in shares)	215		217		216	217
Basic net income per share (in usd per share)	$ 1.47		$ 1.31		$ 2.17	$ 2.48
Diluted net income per share (in usd per share)	$ 1.46		$ 1.30		$ 2.15	$ 2.46