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, 2026	Apr. 30, 2025
Numerator:
Net income	$ 491	$ 152
Denominator:
Denominator for basic net income per share—weighted average shares (in shares)	211	214
Effect of dilutive securities (in shares)	1	2
Denominator for dilutive net income per share (in shares)	212	216
Basic net income per share (in usd per share)	$ 2.33	$ 0.71
Diluted net income per share (in usd per share)	$ 2.32	$ 0.70