Net Income Per Share - Computation of Net Income Per Share Amounts (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Numerator:
Net income	$ 823	$ 497	$ 1,208
Denominator:
Weighted average shares for basic net income per share (in shares)	216	220	219
Effect of dilutive securities (in shares)	2	2	3
Weighted average shares for dilutive net income per share (in shares)	218	222	222
Basic net income per share (in dollars per share)	$ 3.81	$ 2.26	$ 5.52
Diluted net income per share (in dollars per share)	$ 3.78	$ 2.24	$ 5.44