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				6 Months Ended
	Jul. 31, 2026	Apr. 30, 2026	Jul. 31, 2025	Apr. 30, 2025	Jul. 31, 2026	Jul. 31, 2025
Numerator:
Net income	$ 492	$ 491	$ 313	$ 152	$ 983	$ 465
Denominator:
Denominator for basic net income per share—weighted average shares (in shares)	210		213		211	214
Effect of dilutive securities (in shares)	1		2		1	2
Denominator for dilutive net income per share (in shares)	211		215		212	216
Basic net income per share (in usd per share)	$ 2.34		$ 1.47		$ 4.66	$ 2.17
Diluted net income per share (in usd per share)	$ 2.33		$ 1.46		$ 4.64	$ 2.15