Net Income Per Share - Schedule of Computation of Numerator and Denominator in Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Numerator:
Net income	$ 1,124	$ 1,112	$ 906
Denominator:
Weighted average shares for basic net income per share (in shares)	213	215	214
Effect of dilutive securities (in shares)	2	2	2
Weighted average shares for dilutive net income per share (in shares)	215	217	216
Basic net income per share (in dollars per share)	$ 5.28	$ 5.17	$ 4.23
Diluted net income per share (in dollars per share)	$ 5.23	$ 5.12	$ 4.19