Net Income Per Share - Schedule of Computation of Net Income Per Share Amounts (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Numerator:
Net income	$ 1,112	$ 906	$ 823
Denominator:
Weighted average shares for basic net income per share (in shares)	215	214	216
Effect of dilutive securities (in shares)	2	2	2
Weighted average shares for dilutive net income per share (in shares)	217	216	218
Basic net income per share (in dollars per share)	$ 5.17	$ 4.23	$ 3.81
Diluted net income per share (in dollars per share)	$ 5.12	$ 4.19	$ 3.78