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						9 Months Ended
	Oct. 31, 2025	Jul. 31, 2025	Apr. 30, 2025	Oct. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Oct. 31, 2025	Oct. 31, 2024
Numerator:
Net income	$ 343	$ 313	$ 152	$ 275	$ 282	$ 252	$ 808	$ 809
Denominator:
Denominator for basic net income per share—weighted average shares (in shares)	213			215			213	215
Effect of dilutive securities (in shares)	2			2			2	2
Denominator for dilutive net income per share (in shares)	215			217			215	217
Basic net income per share (in usd per share)	$ 1.61			$ 1.28			$ 3.79	$ 3.76
Diluted net income per share (in usd per share)	$ 1.60			$ 1.27			$ 3.76	$ 3.73