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
	Apr. 30, 2025	Apr. 30, 2024
Numerator:
Net income	$ 152	$ 252
Denominator:
Denominator for basic net income per share—weighted average shares (in shares)	214	215
Effect of dilutive securities (in shares)	2	2
Denominator for dilutive net income per share (in shares)	216	217
Basic net income per share (in usd per share)	$ 0.71	$ 1.17
Diluted net income per share (in usd per share)	$ 0.70	$ 1.16